CHROMIUM: usb: gadget: f_accessory: make acc_hid_raw_request 'static'

In commit 1b02fbe the newly added
callback function wasn't set to 'static' by mistake. Set it now.

BUG=chrome-os-partner:49140
TEST=none

Change-Id: I827f3429e0a5e3b420abb0ef1f80fe1c113cd58d
Signed-off-by: Mark Kuo <mkuo@nvidia.com>
Reviewed-on: https://chromium-review.googlesource.com/322101
Reviewed-by: WK TSAI <wk.tsai@nvidia.com>
Reviewed-by: Andrew Bresticker <abrestic@chromium.org>

drivers/usb/gadget/function/f_accessory.c

@@ -404,7 +404,7 @@ static void acc_hid_close(struct hid_device *hid)
 {
 }
 
-int acc_hid_raw_request(struct hid_device *hid, unsigned char reportnum,
+static int acc_hid_raw_request(struct hid_device *hid, unsigned char reportnum,
 	__u8 *buf, size_t len, unsigned char rtype, int reqtype)
 {
 	return 0;