qcom-common: Move reboot options to cm_arrays.xml

* Also temporarily changed reboot_download to reboot_bootloader
  since the former is currently missing.

Change-Id: Ie5925972f0e4a53f6c6b6786860c1981c83f9f11
qcom-common: reboot_bootloader -> reboot_download

Change-Id: I7f2691d359213523220381a746458a13738ac094
Merge remote-tracking branch 'cm/cm-12.0' into cm-12.0