rb5: Add support for Qcom Robotics RB5 development kit

* Add new lunch target "rb5-userdebug"
* Boots android-mainline (3aa53d85a061) to UI
* ADB works
* If you are having display issues on your brand new RB5
  kit then run the following set of adb commands to update
  the lt9611uxc firmware version:
    adb wait-for-device; adb root;
    adb shell "echo 1 > /sys/bus/i2c/devices/5-002b/lt9611uxc_firmware"
  Check installer/rb5/README for more details.

Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Change-Id: I2917de0375e95e17a88446474fdb256af769f73d
11 files changed