qcom: Allow a device to manually override which HALs it wants to use

Like for an example: although ZUK Z2 is actually msm8996, its community built 4.4 kernel
needs msm8998 HALs for proper functionality (VIDC doesn't work at all with msm8996 media HAL).
This is done by adding the following line in BoardConfig:
OVERRIDE_QCOM_HARDWARE_VARIANT := msm8998

Change-Id: I5175f2d3c650ef1b085b13dd96a244cb8df663ff
1 file changed