feat(rdaspen/ras): generate CPER at TF-A EL3

Generate CPER buffer at TF-A EL3, that emits the error data,
when there is a CPU RAS error in the system.

The CPER record consists of:
ESB Header
ESB Da

feat(rdaspen/ras): generate CPER at TF-A EL3

Generate CPER buffer at TF-A EL3, that emits the error data,
when there is a CPU RAS error in the system.

The CPER record consists of:
ESB Header
ESB Data Entry
CPER CPU Error Section
- Arm Processor Error Record
- Arm Processor Error Information
- Arm Processor Context Information

Change-Id: I7e9703a69edec15cbb6f0522333700bb8d7007bf
Signed-off-by: Sanjana Virupakshagouda <sanjana.virupakshagouda@arm.com>
Signed-off-by: Ahmed Tiba <ahmed.tiba@arm.com>

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