boot: Enable XZ compression

Signed-off-by: Locasto <amperific@gmail.com>

Conflicts:
	arch/arm/boot/compressed/Makefile
cpufreq: interactive: sync android-3.0 with android-3.4

Change-Id: I71443db4edbe43a08fe58a54a742b4c788ef11e3
Signed-off-by: Todd Poynor <toddpoynor@google.com>

Conflicts:
	Documentation/cpu-freq/governors.txt
	drivers/cpufreq/cpufreq_interactive.c