Revert "recovery: choose between available fonts based on device density"

* CM recovery does not have /fonts

This reverts commit e12973258af50248118f6f0bd86b29810c9e2dd3.
build: Cleanup CPU-specific optimizations

 * TARGET_ARCH_CPU_VARIANT was a Linaro thing. Now that Android
   introducted TARGET_CPU_VARIANT, we should use this instead.
 * Added CFLAGS for Krait and Scorpion after the cleanup.

Change-Id: Iafb40ecefa353a1169c22601be4ce80069c3f587