mainboard/google/poppy: Use initialized data

A .data section now exists.

Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Change-Id: Ic1510221582aca91c814d43f522a8fb6cba05921
Reviewed-on: https://review.coreboot.org/c/coreboot/+/78937
Reviewed-by: Martin L Roth <gaumless@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/poppy/variants/nautilus/sku.c

@@ -6,14 +6,10 @@
 
 uint32_t variant_board_sku(void)
 {
-#if ENV_ROMSTAGE
-	uint32_t sku_id = SKU_UNKNOWN;
-#else
 	static uint32_t sku_id = SKU_UNKNOWN;
 
 	if (sku_id != SKU_UNKNOWN)
 		return sku_id;
-#endif
 
 	/*
 	*  Nautilus uses GPP_B20 to determine SKU