soc/intel/braswell/chip.h: Add IGD_MEMSIZE_xxMB

Add defines to have some more readable code for devcietree.cb.

BUG=N/A
TEST=4K HDMI monitor and LCD working fine on Facebook FBG-1701

Change-Id: Ifc1a7657a528d1fc570dd16df66b078e37e014cb
Signed-off-by: Frans Hendriks <fhendriks@eltan.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35751
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

src/soc/intel/braswell/chip.h

@@ -32,6 +32,11 @@
 #define SVID_CONFIG3		3
 #define SVID_PMIC_CONFIG	8
 
+#define IGD_MEMSIZE_32MB	0x01
+#define IGD_MEMSIZE_64MB	0x02
+#define IGD_MEMSIZE_96MB	0x03
+#define IGD_MEMSIZE_128MB	0x04
+
 enum lpe_clk_src {
 	LPE_CLK_SRC_XTAL,
 	LPE_CLK_SRC_PLL,