ARM: dts: msm: Disable mmc rescan on SA415M TTP

This commit disables scanning for mmc card presence
again and again on SA415M TTP devices as the presence
is handled through GPIO. This scanning otherwise
causes unnecessary CPU consumption.

Change-Id: Ic08482064c49a9c24780c86a8c719636e1528cbd
Signed-off-by: Rishi Gupta <rishgupt@codeaurora.org>