HID: samsung: Rewrite rdesc checking code using memcmp()

Resolved warnings found by checkpatch.pl script.

Signed-off-by: Sandeep C S <sandeep.cs@samsung.com>
Signed-off-by: Junwan Cho <junwan.cho@samsung.com>
Signed-off-by: Jitender Sajwan <jitender.s21@samsung.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>