ynl: support hex display_hint for integer

Some times it would be convenient to read the integer as hex, like
mask values.

Suggested-by: Donald Hunter <donald.hunter@gmail.com>
Reviewed-by: Donald Hunter <donald.hunter@gmail.com>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Link: https://lore.kernel.org/r/20240327123130.1322921-2-liuhangbin@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

tools/net/ynl/lib/ynl.py

@@ -819,6 +819,9 @@ class YnlFamily(SpecFamily):
         if display_hint == 'mac':
             formatted = ':'.join('%02x' % b for b in raw)
         elif display_hint == 'hex':
+            if isinstance(raw, int):
+                formatted = hex(raw)
+            else:
                 formatted = bytes.hex(raw, ' ')
         elif display_hint in [ 'ipv4', 'ipv6' ]:
             formatted = format(ipaddress.ip_address(raw))