Revert "vendor: Add qcom platform type to soongs vars"

These vars are no longer useful as of Q because it looks like CAF dropped
their surfaceflinger extensions (ExtSurfaceFlinger).

This reverts commit 97cb87c80972e109dedf58fb71b03489b97dd923.

Change-Id: I09701f6a47830a30486f35052b4ea7ab15a9660b
3 files changed