ARM: dts: msm: Add SDC2 device support on SDM855 platforms

Add the SDC2 device settings to include support for the SD card
for the SDM855 platforms.

Change-Id: Ifd1bb9263d76cbd7d8837bdf433366b91fc12bad
Signed-off-by: Bao D. Nguyen <nguyenb@codeaurora.org>