ARM: dts: msm: Add DT support for SPSS and GENI-IR on MPQ8092

Add SPSS and GENI-IR device nodes to the MPQ8092 device tree.
Also add default configuration for PMIC_GPIO_15 in the MPQ8092
device tree which is required to enable the SPSS slow clock.

Change-Id: Iea0c4ea3fed5ac7258c3c989a9b51459e98f30b1
Signed-off-by: Niranjana Vishwanathapura <nvishwan@codeaurora.org>