feat(rcar): add initial BL31 support for Renesas R-Car X5H

This patch introduces initial BL31 (EL3 firmware) support for the
Renesas R-Car Gen5 (X5H) platform.

Key features and changes include:
- P

feat(rcar): add initial BL31 support for Renesas R-Car X5H

This patch introduces initial BL31 (EL3 firmware) support for the
Renesas R-Car Gen5 (X5H) platform.

Key features and changes include:
- Platform definitions and memory map for R-Car X5H
(Cortex-A720AE, 8 clusters x 4 cores)
- Platform-specific PSCI power management and topology
- SCMI-based power domain and system power management
- GICv4/Fainlight-AE interrupt controller initialization and support
- Trusted SRAM, shared memory, and crash log region setup
- SCIF console support
- Stack protector implementation for enhanced security
- Platform-specific linker script and build integration
- Various helper and initialization routines for MMU, GIC, and SCMI
- Platform-specific mailbox and boot flow handling
- Basic suspend implementation via SCP-FW
- AMU counters, SVE, PAUTH accessible to EL1

Signed-off-by: Hieu Nguyen <hieu.nguyen.dn@renesas.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Change-Id: I04be48a55a618fe952b28283d2f85f48f7761c9a

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