soc/intel/broadwell/include/soc/me.h: Use C99 flexible arrays

Use C99 flexible arrays instead of older style of one-element or
zero-length arrays.
It allows the compiler to generate errors when the flexible array does
not occur at the end in the structure.

Change-Id: I2d65e9dbefc8fa5d8288151995a587f76049c65a
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76837
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>

src/soc/intel/broadwell/include/soc/me.h

@@ -429,7 +429,7 @@ typedef struct {
 	u8        icc_profile_index;
 	u8        reserved;
 	u32       icc_reg_bundles;
-	icc_address_mask icc_address_mask[0];
+	icc_address_mask icc_address_mask[];
 } __packed mbp_icc_profile;
 
 typedef struct {