unzip: set ENABLE_DESKTOP to allow unpacking signed Android OTAs

Without this flag set, attempting to use BusyBox unzip to unpack a
signed Android OTA results in the error

unzip: zip flags 1 and 8 are not supported

Set ENABLE_DESKTOP for the unzip code to enable the necessary feature.

Change-Id: I3f764bde678311a8d3de787ea503f9cc793337a3
Always enable reboot applet

Change-Id: I14311a4fbcf559a075fa46c2b6d2c1848b31c362
Enable swap device priority

Change-Id: I214ffed2441ad1f901dc03bce0aa008255374b95