firmware: di_adv: Move to new scheme where qpu code handles top/botto…

…m edges

See: raspberrypi#463

firmware: di_adv: Add config setting to add nop delays to shader
See: http://forum.kodi.tv/showthread.php?tid=231092&pid=2150605#pid2150605

firmware: vcilcs: Avoid a potential deadlock when very threaded
See: raspberrypi#449

firmware: vrf: Add spinlock around vrf acquire/release calls to avoid restoring an invalid p10 from ISR context

firmware: rpi_display: only ratelimit if the backlight is actually changed
See: raspberrypi/linux#1179

firmware: di_adv: Support multiple instances of qpu deinterlace at SD resolution
See: popcornmix/omxplayer#386

linux: rpi-ft5406: Use interruptible sleep to avoid high load reported
See: https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=125034

linux: dts: Added overlay for Adafruit PiTFT 2.8 capacitive touch screen
See: raspberrypi/linux#1192

linux: config: Add MCP320X
See: raspberrypi/linux#1189

linux: Build i2c_gpio module and add a device tree overlay to configure it
See: raspberrypi/linux#1183