Add support for building Clockwork Recovery.

Preparing this so cherry picks are clean.

Change-Id: I9ca4084c0f19824c967bcdbb19b6aac02f547f80

Prevent building of patch recovery if so desired.

Preparing this so cherry picks are clean.

Change-Id: I96aa45fdc5f035732c3f2d4b0bd2c3b523bb87b1

delete device specific rc from ramdisk of recovery

this does not need to be built...

add support for explicitly setting a ramdisk address

support page size flag for boot images

allow separate recovery kernels

Change-Id: I0e4df1e1b3440cf2b3a37fe41aa22791dda1aa47