BoardConfigCommon: Add TARGET_CPU_VARIANT

Needs cortex-a8 support in bionic

Change-Id: I45342e3ed2e02bf92988322866f362e91477d61e
Signed-off-by: helicopter88 <johnlemon.lol@gmail.com>
msm8660: Remove bugmailer

Doesn't exist (yet) in 4.3
Signed-off-by: helicopter88 <johnlemon.lol@gmail.com>

Change-Id: If768872f230c65956d452d263f8ab38232bb1e43