AWS: Ensure the product UUID is uppercase

Newer kernels seem to return this in lowercase format which makes the
comparison to "EC2" fail.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

src/initscripts/system/functions

@@ -797,6 +797,9 @@ running_on_ec2() {
 	if [ -r "/sys/devices/virtual/dmi/id/product_uuid" ]; then
 		uuid=$(</sys/devices/virtual/dmi/id/product_uuid)
 
+		# Convert the UUID as uppercase
+		uuid="${uuid^^}"
+
 		[ "${uuid:0:3}" = "EC2" ] && return 0
 	fi