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Add support for System Guidance for Mobile platform SGM775

Change-Id: I2442a50caae8f597e5e5949cd48f695cf75d9653
Signed-off-by: Nariman Poushin <nariman.poushin@linaro.org>

Add a platform specific handler for RAS interrupts and configure the
platform RAS interrupts for EL3 handling. The interrupt handler passes
control to StandaloneMM code executing in S-EL0, which populates the
CPER buffer with relevant error information. The handler subsequently
invokes the SDEI client which processes the information in the error
information in the CPER buffer. The helper functions
plat_sgi_get_ras_ev_map and plat_sgi_get_ras_ev_map_size would be
defined for sgi platforms in the subsequent patch, which adds sgi575
specific RAS changes.

Change-Id: I490f16c15d9917ac40bdc0441659b92380108d63
Signed-off-by: Sughosh Ganu <sughosh.ganu@arm.com>

Remove the existing method of populating the platform id in arg2 of
BL33 which is no longer needed with dynamic configuration feature
enabled as the BL33 will get this information directly via the config
files. Add the tb_fw_config and hw_config dts files.

Change-Id: I3c93fec2aedf9ef1f774a5f0969d2d024e47ed2c
Signed-off-by: Chandni Cherukuri <chandni.cherukuri@arm.com>

Add support for System Guidance for Infrastructure platform SGI575.

Change-Id: I0125c2ed4469fbc8367dafcc8adce770b6b3147d
Signed-off-by: Nariman Poushin <nariman.poushin@linaro.org>