Update to lastest master

Update to latest master

firmware: rebuild with Avoid PM_SPARE bit 23

firmware: arm_loader: Use legacy cmdline parameters on 4.4

firmware: video_render: Accept OMX_IndexParamRemoveImagePadding

firmware: FXL6408/GPIOman: Support config of termination via dt-blob

firmware: GPIO expander: Add API to reconfigure pins
firmware: GPIOMAN: Add API to reconfigure pins
firmware: Mailbox service: Add command to reconfigure GPIO setup
firmware: FXL6408: Return success code on reading status of an output
firmware: GPIO expander: Add set/get_config functions to dummy driver

kernel: Bump to 4.4.38

firmware: TC358762: Fix broken backlight ratelimiting

kernel: Bump to 4.4.26

platform: Enable support for Pi2+

firmware: Fix incorrect symlink for libGLESv1_CM.so

See: Hexxeh/rpi-firmware#122

firmware: RIL: Correct RGB888 and BGR888 handling in camera and video_splitter
See: https://www.raspberrypi.org/forums/viewtopic.php?f=43&t=148432

firmware: RaspiStill: Update annotation before capture
See: raspberrypi/userland#321

firmware: dispmanx: Avoid attaching DSI display to dispmanx when ignore_lcd=2
firmware: arm_loader: Stop hotplug checking when v3d-kms-v3d driver is enabled

firmware: gencmd: Provide mechanism to reset persistent throttled bits