ARM: dts: msm: Add G-Link SMEM Transport device nodes for sdm670

These device nodes allow the G-Link SMEM Transport to function,
which allows G-Link to use shared memory as an underlying physical
transport.

CRs-Fixed: 2059063
Change-Id: I8ba268711d75d77348cf9564c3760a154c9742c4
Signed-off-by: Dhoat Harpal <hdhoat@codeaurora.org>