Add firmware path to the firmware search paths.

Add firmware path to the firmware search paths.

If the kernel is able to find firmware in the kernel firmware
search path (when requested through request_firmware()) it will
load it directly without the involvement of the usermodehelper/
udev process (which is not always available).

Bug 1403956

Change-Id: Ic66b6dc306002c7baac541cf94ad89d29c1d397d
Signed-off-by: Neil Gabriel <ngabriel@nvidia.com>
Reviewed-on: http://git-master/r/360474
Reviewed-by: Mitch Luban <mluban@nvidia.com>
Reviewed-on: http://git-master/r/362435