mb/google/kahlee: Increase VRAM from 16 to 32 MiB

While adequate for ChromeOS, 16MiB VRAM is insufficient for current
mainline Linux and Windows amdgpu drivers to operate properly. Under
Linux, the driver fails to allocate a framebuffer and causes multiple
kernel panics. Under Windows, the driver fails to load due to
insufficient resources available. Revert the VRAM allocation to the
previous amount of 32MiB.

This change reverts
commit 87dcd0061a ("mainboard/google/kahlee: Reduce VRAM to 16MB")

Test: build/boot Linux 5.17.x on google/liara, verify framebuffer
allocation succeeds and no kernel panic reported.

Change-Id: I1967a203fed80456a20af00943eba21bc1c0577b
Signed-off-by: Matt DeVillier (AMD) <matt.devillier@amd.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66022
Reviewed-by: Martin Roth <martin.roth@amd.corp-partner.google.com>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/kahlee/variants/aleena/devicetree.cb

@@ -7,7 +7,7 @@ chip soc/amd/stoneyridge
 	}"
 	register "dram_clear_on_reset" = "DRAM_CONTENTS_KEEP"
 	register "uma_mode" = "UMAMODE_SPECIFIED_SIZE"
-	register "uma_size" = "16 * MiB"
+	register "uma_size" = "32 * MiB"
 	register "stapm_percent" = "80"
 	register "stapm_time_ms" = "2500000"
 	register "stapm_power_mw" = "7800"

src/mainboard/google/kahlee/variants/careena/devicetree.cb

@@ -7,7 +7,7 @@ chip soc/amd/stoneyridge
 	}"
 	register "dram_clear_on_reset" = "DRAM_CONTENTS_KEEP"
 	register "uma_mode" = "UMAMODE_SPECIFIED_SIZE"
-	register "uma_size" = "16 * MiB"
+	register "uma_size" = "32 * MiB"
 	register "stapm_percent" = "68"
 	register "stapm_time_ms" = "2500000"
 	register "stapm_power_mw" = "7800"

src/mainboard/google/kahlee/variants/grunt/devicetree.cb

@@ -7,7 +7,7 @@ chip soc/amd/stoneyridge
 	}"
 	register "dram_clear_on_reset" = "DRAM_CONTENTS_KEEP"
 	register "uma_mode" = "UMAMODE_SPECIFIED_SIZE"
-	register "uma_size" = "16 * MiB"
+	register "uma_size" = "32 * MiB"
 	register "stapm_percent" = "80"
 	register "stapm_time_ms" = "2500000"
 	register "stapm_power_mw" = "7800"

src/mainboard/google/kahlee/variants/liara/devicetree.cb

@@ -7,7 +7,7 @@ chip soc/amd/stoneyridge
 	}"
 	register "dram_clear_on_reset" = "DRAM_CONTENTS_KEEP"
 	register "uma_mode" = "UMAMODE_SPECIFIED_SIZE"
-	register "uma_size" = "16 * MiB"
+	register "uma_size" = "32 * MiB"
 	register "lvds_poseq_varybl_to_blon" = "0x5" # in 4ms
 	register "lvds_poseq_blon_to_varybl" = "0x5" # in 4ms
 

src/mainboard/google/kahlee/variants/nuwani/devicetree.cb

@@ -7,7 +7,7 @@ chip soc/amd/stoneyridge
 	}"
 	register "dram_clear_on_reset" = "DRAM_CONTENTS_KEEP"
 	register "uma_mode" = "UMAMODE_SPECIFIED_SIZE"
-	register "uma_size" = "16 * MiB"
+	register "uma_size" = "32 * MiB"
 	register "stapm_percent" = "80"
 	register "stapm_time_ms" = "2000000"
 	register "stapm_power_mw" = "7800"

src/mainboard/google/kahlee/variants/treeya/devicetree.cb

@@ -7,7 +7,7 @@ chip soc/amd/stoneyridge
 	}"
 	register "dram_clear_on_reset" = "DRAM_CONTENTS_KEEP"
 	register "uma_mode" = "UMAMODE_SPECIFIED_SIZE"
-	register "uma_size" = "16 * MiB"
+	register "uma_size" = "32 * MiB"
 	register "stapm_percent" = "80"
 	register "stapm_time_ms" = "2000000"
 	register "stapm_power_mw" = "7800"