Disable apicheck

We don't provide any API for applications and therefor don't have to check it.

Signed-off-by: Yen-Chin Lee <coldnew.tw@gmail.com>
Add TARGET_SPECIFIC_HEADER_PATH for device own headers

Now we can add TARGET_SPECIFIC_HEADER_PATH in BoardConfig.mk to add
local headers

Signed-off-by: Yen-Chin Lee <coldnew.tw@gmail.com>