usb: gadget: mbim: Remove duplicate unlock

Function mbim_notify should be called inside locked context,
add missing lock.
Also remove duplicate lock initialization.

CRs-Fixed: 366821
Change-Id: I3431b20e831c807da7fa74cc40aa098f43330a9b
Signed-off-by: Anna Perel <aperel@codeaurora.org>
1 file changed