mb/google/poppy: Add support for a variant finalize function

Add a hook to allow a variant finalize to be called at the end of
ramstage.

BUG=b:245954151
TEST=Builds successfully

Change-Id: I00c091051e3499ca94b286d7fbe0a7a8bd38e635
Signed-off-by: Tarun Tuli <taruntuli@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/70319
Reviewed-by: Subrata Banik <subratabanik@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/poppy/mainboard.c

@@ -60,7 +60,18 @@ static void mainboard_chip_init(void *chip_info)
 	gpio_configure_pads(pads, num);
 }
 
+void __weak variant_final(void)
+{
+	/* nop */
+}
+
+static void mainboard_final(void *chip_info)
+{
+	variant_final();
+}
+
 struct chip_operations mainboard_ops = {
 	.init = mainboard_chip_init,
 	.enable_dev = mainboard_enable,
+	.final = mainboard_final
 };

src/mainboard/google/poppy/variants/baseboard/include/baseboard/variants.h

@@ -55,6 +55,7 @@ int variant_memory_sku(void);
 void variant_devtree_update(void);
 uint32_t variant_board_sku(void);
 void variant_smi_sleep(u8 slp_typ);
+void variant_final(void);
 
 struct nhlt;
 void variant_nhlt_init(struct nhlt *nhlt);