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Dynamically populating the 'system-id' node in the HW_CONFIG dts makes
it difficult to enforce memory overlap checks. So add the system-id node
in the HW_CONFIG dts file as a place holder with 'platform-id' and
'config-id' set to zero.

The code at BL2 stage determines the values of 'platform-id' and
'config-id' at runtime and updates the corresponding fields in the
system-id node of HW_CONFIG dts.

Change-Id: I2ca9980b994ac418da8afa0c72716ede10aff68a
Signed-off-by: Chandni Cherukuri <chandni.cherukuri@arm.com>

To align the placement of ftds files with that of other Arm platforms,
move the ftds files from plat/arm/css/sgi/ to plat/arm/board/sgi575.

Change-Id: Id7c772eb5cf3d308d4e02a3c8099218e889a0e96
Signed-off-by: Chandni Cherukuri <chandni.cherukuri@arm.com>