jewel: remove non-CM/CWM configurations

TWRP is a separate project. Really, we need to abide by the "eat your own
dogfood" philosophy anyways and use CWM to motivate improving it.

Note: although TARGET_RECOVERY_PIXEL_FORMAT is not TWRP specific, it is
already defined in s4-common.

Change-Id: I27c83de8ee7975b886a5a48d10e81d4dd73fe085