drm/msm/dp: add orientation support for simulation mode

Add support to specify the plug orientation during the connect
event in simulation mode. For example:
	"echo 1 > /d/drm_dp/hpd" for normal plug orientation
	"echo 5 > /d/drm_dp/hpd" for flip plug orientation
Furthermore, do not program the AUX switch device if we are in
simulation mode as this might cause unexpected behaviour for
USB functionality.

Change-Id: I932b011aee97e584f3206c98115161b4041a4803
Signed-off-by: Tatenda Chipeperekwa <tatendac@codeaurora.org>