mm-core: Remove obsolete msm7x30 OMX code

This is a leftover since long time ago, remove it to prevent
any conflicts with the normal omx

Change-Id: I8c2ddfb851dc3147361de17fe929b0a577ad9270
Merge "mm-core: Remove obsolete msm7x30 OMX code" into qcom-4.4_2.7