ARM: dts: mdm9630: Provide PERIPH_SS_AHB2PHY register address

Prior to initializing the QMP PHY, it is recommended to configure
the AHB2PHY bridge to operate with one wait state reads and writes.
Hence provide PERIPH_SS_AHB2PHY_TOP_CFG register address to
configure this functionality.

Change-Id: I999750be3435500c848426416e85a9fbd2643cb1
Signed-off-by: Mayank Rana <mrana@codeaurora.org>