HID: letsketch: add missing MODULE_DESCRIPTION() macro

make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/hid/hid-letsketch.o

Add the missing invocation of the MODULE_DESCRIPTION() macro.

Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20240604-md-hid-letsketch-v1-1-ff38ae7b4cb0@quicinc.com


Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>