[moto] external_common: hdmi updates

Change-Id: Iac708573513dbf6b45a987b1f7a786e7472f7f53
Revert "Revert "msm_fb: display: Create hdmi_as_primary node for boot parameter case""

This reverts commit 4f75e40dc73f5b7f744c1550b26ccf74112a6425.