board/*/genimage.cfg: use partition-type-uuid U where relevant

This commit changes to use partition-type-uuid = U instead of
c12a7328-f81f-11d2-ba4b-00a0c93ec93b where relevant for the EFI System
Partition.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

board/aarch64-efi/genimage-efi.cfg

@@ -18,7 +18,7 @@ image disk.img {
 
 	partition boot {
 		image = "efi-part.vfat"
-		partition-type-uuid = c12a7328-f81f-11d2-ba4b-00a0c93ec93b
+		partition-type-uuid = U
 		offset = 32K
 		bootable = true
 	}

board/pc/genimage-efi.cfg

@@ -19,7 +19,7 @@ image disk.img {
 
 	partition boot {
 		image = "efi-part.vfat"
-		partition-type-uuid = c12a7328-f81f-11d2-ba4b-00a0c93ec93b
+		partition-type-uuid = U
 		offset = 32K
 		bootable = true
 	}

board/qemu/aarch64-sbsa/genimage.cfg

@@ -19,7 +19,7 @@ image disk.img {
 
 	partition boot {
 		image = "efi-part.vfat"
-		partition-type-uuid = c12a7328-f81f-11d2-ba4b-00a0c93ec93b
+		partition-type-uuid = U
 		offset = 32K
 		bootable = true
 	}