build: Add Qualcomm's helper macros

 * This is used everywhere in Qualcomm's code. There's no reason we need
   to constantly replace it with uglier stuff in our Makefiles.

Change-Id: I0183a338470ec96a38f356a47bae65a0d3fb2c95
build: Add board platforms to qcom_utils

Change-Id: I85458167bf2b9c04b029d09b87bf791ff4cfd04d