qcom: enable qcom bionic optimizations

Change-Id: I238ada5611664ecca3f91ade4a994b3e1b75cad4
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