ARM: dts: msm8916: Update board variant ID for QRD platform

For QRD platform, the variant ID is the combination of subtype,
major version, minor version and hw_platform. So update the
variant ID in DT to keep it coincident with CDT.

Change-Id: I769e3248fc11017217a7c0eac0477aab226ba55a
Signed-off-by: Xiaocheng Li <lix@codeaurora.org>