ARM: dts: msm: Add DT entries to use mmc features in sdm670

Add bus bandwidth voting and qos voting entires in the sdm670 device
tree(DT) files so that the features will be used by the respective
drivers. Also add card detect gpio for sd card driver.

Change-Id: I9310fa4f81bf2ae9121624e7dbf35e10efc3c359
Signed-off-by: Vijay Viswanath <vviswana@codeaurora.org>