fix kernel includes (Evervolv)

Based on https://github.com/Evervolv/android_kernel_htc_msm7x30-3.0/commit/92569cf92455d5f098ef01aa38370dfc7fd65bda

qcom/display seems to pick up its headers from include/linux just
fine already. qcom/audio-caf still lacks kernel headers import for
7x30 so they are still present in msm7x30-common.

Change-Id: I6659ffd540ce6e6f3c1538bd6615d64bd18b20ed