Make TFTF RFC 4122 compliant

This is a TFTF backport of a change that makes TF RFC 4122-compliant
by converting the stored format of UUIDs from machine order (little
endian) to network order (big endian).

This patch changes the data structure used to store the values in the
same way as in the related change in TF:
033648652f2d66abe2454a75ded891a47cb13446.

Signed-off-by: Oliver Swede <oli.swede@arm.com>
Change-Id: I052e570b80de61f87a049a08e347a2e5da7f841b
diff --git a/include/common/firmware_image_package.h b/include/common/firmware_image_package.h
index f168f23..aba5b57 100644
--- a/include/common/firmware_image_package.h
+++ b/include/common/firmware_image_package.h
@@ -15,13 +15,13 @@
 
 /* ToC Entry UUIDs */
 #define UUID_FIRMWARE_UPDATE_SCP_BL2U \
-	{0x03279265, 0x742f, 0x44e6, 0x8d, 0xff, {0x57, 0x9a, 0xc1, 0xff, 0x06, 0x10} }
+	{{0x65, 0x92, 0x27, 0x03}, {0x2f, 0x74}, {0xe6, 0x44}, 0x8d, 0xff, {0x57, 0x9a, 0xc1, 0xff, 0x06, 0x10} }
 #define UUID_FIRMWARE_UPDATE_BL2U \
-	{0x37ebb360, 0xe5c1, 0x41ea, 0x9d, 0xf3, {0x19, 0xed, 0xa1, 0x1f, 0x68, 0x01} }
+	{{0x60, 0xb3, 0xeb, 0x37}, {0xc1, 0xe5}, {0xea, 0x41}, 0x9d, 0xf3, {0x19, 0xed, 0xa1, 0x1f, 0x68, 0x01} }
 #define UUID_FIRMWARE_UPDATE_NS_BL2U \
-	{0x111d514f, 0xe52b, 0x494e, 0xb4, 0xc5, {0x83, 0xc2, 0xf7, 0x15, 0x84, 0x0a} }
+	{{0x4f, 0x51, 0x1d, 0x11}, {0x2b, 0xe5}, {0x4e, 0x49}, 0xb4, 0xc5, {0x83, 0xc2, 0xf7, 0x15, 0x84, 0x0a} }
 #define UUID_FIRMWARE_UPDATE_FWU_CERT \
-	{0xb28a4071, 0xd618, 0x4c87, 0x8b, 0x2e, {0xc6, 0xdc, 0xcd, 0x50, 0xf0, 0x96} }
+	{{0x71, 0x40, 0x8a, 0xb2}, {0x18, 0xd6}, {0x87, 0x4c}, 0x8b, 0x2e, {0xc6, 0xdc, 0xcd, 0x50, 0xf0, 0x96} }
 
 typedef struct fip_toc_header {
 	uint32_t	name;