ARM: dts: mdm: enable sd card detect for 9630 cdp

Add SD card detect gpio line and interrupt details so that the SD
card insertion and removal events can be detected without having
to poll for it.

CRs-Fixed: 601511
Change-Id: I3202a8af9a5040f1655d848cdf1cc24bb05a5d4f
Signed-off-by: Krishna Konda <kkonda@codeaurora.org>