USB: s3c-hsotg: Fix control request processing

UDC driver does not need to generate reply to host if request is
delivered to gadget. This is gadget's responsibility. This commit
fixes that.

Signed-off-by: Anton Tikhomirov <av.tikhomirov@samsung.com>
Reviewed-by: Kyoungil <Kim&lt;ki0351.kim@samsung.com>
Cc: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>