build: core: Parameterize recovery with a variant

Include extra vendor config early.  If RECOVERY_VARIANT is set, use it
to look for the recovery in an alternate path.

Change-Id: Iba54f0746d728c0dfeeb67b4d3166d5e25b1b5d7
Signed-off-by: Arnav Gupta <championswimmer@aokp.co>
Merge "build: core: Parameterize recovery with a variant" into kitkat
Build: support building with openjdk and java6

Change-Id: I4359f802722a7563ff9acbbc9f30b8f7499f4609
Merge "Build: support building with openjdk and java6" into kitkat
Merge "build: core: Parameterize recovery with a variant" into kitkat
Merge commit '7b86bac3fc42de5cc35ed801ff2ec6f9e29a4010' into kitkat
Merge "Build: support building with openjdk and java6" into kitkat
Merge commit '65ffddbe0243bbef5ed72c39c7ac5b7c28cbe2ec' into kitkat
Re-evaluate the pathmap

If RECOVERY_VARIANT is used then path to recovery could have had changed,
so rebuild the pathmap to compensate. This lets the variable be
defined in BoardConfig files instead of the global environment

Change-Id: I87c23a452656ffa7817711796c17f79e30465756