ARM: dts: msm: Add eMMC support for SDM670 QRD platform

SDM670 QRD platform device tree has no eMMC host
controller sdhc_1 node. This change enables
eMMC support by adding eMMC host controller
node sdhc_1 into device tree.

Change-Id: Ie4d60b57b7aa2c8ea23ab78cf423f74ad134555d
Signed-off-by: Can Guo <cang@codeaurora.org>