ARM: dts: msm: Add SPI config regs base address for all sdm/msm targets

Add base address of shared SPI config registers for all sdm/msm targets
and provided name as "spi_cfg_regs".

Change-Id: I4af1b9bf620060d2a2ab3aaf933f17b5a13e7b05
Signed-off-by: Raghavendra Kakarla <rkakarla@codeaurora.org>