HID: intel_ish-hid: use %pUL for uuid formatting

We have the %pU printf extension for doing exactly this. Saves some
.text, and is likely also a little faster.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>