Use the device's architecture instead of noarch. Because the device
packages should never be built for other architectures, even if all
depends can be built for other arches as well.
This simplifies package building as part of the new build
infrastructure effort.
pmbootstrap has also been changed to output this by default in
aportgen.
Note about PMOS_NO_SAFESTRAP kernel cmdline:
This can be used to forcefully skip SafeStrap partition mount in device
initramfs hook, for example when booting with droid4-kexecboot on device with
SafeStrap configured as well.
