Revert "drm/vc4: Add support for H & V flips"

This reverts commit 3293cb5284bf7c80217cba8e7c3f67fba1953e1d.
This functionality has already been added via
"7cd3cf35 drm/vc4: Add support for X/Y reflection"
Calling drm_plane_create_rotation_property corrupts the
plane properties list.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>