ARM: dts: qcom: Add spcom scsr in kona device tree

Add spcom scsr register address and bitmask in kona device tree
that is written to by spcom kernel to indicate to Secure
Processor that it is being restarted as part of subsystem
restart. This is needed to support an FR for supporting
loading of Secure Processor in UEFI stage.

Change-Id: I5ff1469a7be519855e34b9d5168a641669edc0d8