HID: fix hidraw_exit section mismatch

hidraw_exit() marked as __exit is called from __init function
from HID core. Remove the section placement from that function.

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>