Add CONFIG_FW_LOADER_USER_HELPER(_FALLBACK)=y to imx_v6_v7_defconfig

Yes udev stopped checking firmware entries in sysfs but there are other helpers
still doing so: I my case it is networkmanager which makes Bluetooth work
after applying this patch on Variscite VarSOM.

Without this patch it seems kernel tries three times to load firmware without
success (at that time there is no rootfs yet):
| Aug 24 13:34:24 imx6qdl-variscite-som kernel: hci-ti serial0-0: Direct firmware load for ti-connectivity/TIInit_11.8.32.bts failed with error -2
| Aug 24 13:34:24 imx6qdl-variscite-som kernel: Bluetooth: hci0: request_firmware failed(errno -2) for ti-connectivity/TIInit_11.8.32.bts
| Aug 24 13:34:24 imx6qdl-variscite-som kernel: Bluetooth: hci0: download firmware failed, retrying...
| ...
| Aug 24 13:34:24 imx6qdl-variscite-som kernel: hci-ti serial0-0: Direct firmware load for ti-connectivity/TIInit_11.8.32.bts failed with error -2
| Aug 24 13:34:24 imx6qdl-variscite-som kernel: Bluetooth: hci0: request_firmware failed(errno -2) for ti-connectivity/TIInit_11.8.32.bts
| Aug 24 13:34:24 imx6qdl-variscite-som kernel: Bluetooth: hci0: download firmware failed, retrying...
| ...
| Aug 24 13:34:24 imx6qdl-variscite-som kernel: hci-ti serial0-0: Direct firmware load for ti-connectivity/TIInit_11.8.32.bts failed with error -2
| Aug 24 13:34:24 imx6qdl-variscite-som kernel: Bluetooth: hci0: request_firmware failed(errno -2) for ti-connectivity/TIInit_11.8.32.bts
| Aug 24 13:34:24 imx6qdl-variscite-som kernel: Bluetooth: hci0: download firmware failed, retrying...

With this patch:
| Aug 24 13:34:24 imx6qdl-variscite-som kernel: hci-ti serial0-0: Direct firmware load for ti-connectivity/TIInit_11.8.32.bts failed with error -2
| Aug 24 13:34:24 imx6qdl-variscite-som kernel: hci-ti serial0-0: Falling back to user helper
| ...
| Aug 24 13:34:34 imx6qdl-variscite-som NetworkManager[362]: <info>  [1535117674.5468] manager[0x17fd0d8]: monitoring kernel firmware directory '/lib/firmware'.
| ...
| Aug 24 13:34:47 imx6qdl-variscite-som kernel: Bluetooth: hci0: send command failed
| Aug 24 13:34:47 imx6qdl-variscite-som kernel: Bluetooth: hci0: download firmware failed, retrying...
| Aug 24 13:34:48 imx6qdl-variscite-som kernel: Bluetooth: hci0: change remote baud rate command in firmware

It seems there is one failure on download but the firmware is reachable and
it ends with succes: there is a working Bluetooth!

Signed-off-by: Andreas Müller <schnitzeltony@gmail.com>

arch/arm/configs/imx_v6_v7_defconfig

@@ -91,6 +91,8 @@ CONFIG_DEVTMPFS=y
 CONFIG_DEVTMPFS_MOUNT=y
 # CONFIG_STANDALONE is not set
 CONFIG_CMA_SIZE_MBYTES=64
+CONFIG_FW_LOADER_USER_HELPER=y
+CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y
 CONFIG_IMX_WEIM=y
 CONFIG_CONNECTOR=y
 CONFIG_MTD=y