a0001: Remove support for msm8974pro-ab A0001

* MSM8974 Pro AB based A0001 are early pre-production devices only,
  so drop support for them.

Change-Id: I0a375fb17deccc1aa792db6146aaa9036cc3b804
x9007: Remove support for msm8974pro-ac X9007

* All X9007 devices are MSM8974 Pro AB based, drop support for this
  unused board/platform combination.

Change-Id: I1b17ccfc76a633bc82b059d25d5661db446529b0
x9007: Remove unused panel entries

Change-Id: I830188cf254bfa30e394e3a41f2ef3e2466f8e27