ARM: dts: msm: Add SDC2 device support for Kona platforms

Add the SDC2 device settings to include support for the SD card
for the Kona platforms.

Change-Id: I74c06765e46b0b76f7b4770a47ceb114b92867df
Signed-off-by: Bao D. Nguyen <nguyenb@codeaurora.org>