amenia: enable tcpc support for amenia 1.2

added Analogix AXN7428 and ParadeTech PS8751

note: hdp support is wip

BUG=none
BRANCH=none
TEST=make buildall

Change-Id: I4ff1a2ad03da8e625e869482102d6c3a1ca2aa50
Signed-off-by: Kevin K Wong <kevin.k.wong@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/341535
Commit-Ready: Vijay P Hiremath <vijay.p.hiremath@intel.com>
Tested-by: Vijay P Hiremath <vijay.p.hiremath@intel.com>
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Reviewed-by: Shawn N <shawnn@chromium.org>