core: arm: refactor RD-1AE and RD-Aspen into automotive_rd flavors

This change moves RD-1AE and RD-Aspen under a single
automotive_rd platform with per-flavor configuration.

Key updates:
- Introduc

core: arm: refactor RD-1AE and RD-Aspen into automotive_rd flavors

This change moves RD-1AE and RD-Aspen under a single
automotive_rd platform with per-flavor configuration.

Key updates:
- Introduce plat-automotive_rd/ with shared main.c,
platform_config.h and Makefiles.
- Define RD-1AE and RD-Aspen are selected
via PLATFORM_FLAVOR rd1ae or rdaspen.
- Merge flavor settings (UART/GIC/DRAM/topology)
into platform_config.h and conf.mk files.
- Use default get_core_pos_mpidr() by setting appropriate
CFG_CORE_CLUSTER_SHIFT / CFG_CORE_THREAD_SHIFT for rdaspen,
eliminating custom assembly where not required.

Benefits:
- Consistent with OP-TEE’s platform/variant framework.
- Reduces code duplication between RD-1AE and RD-Aspen.
- Simplifies adding new automotive reference design flavors
in the future.

Usage:
- Set PLATFORM=automotive_rd
- Set PLATFORM_FLAVOR to rdaspen or rd1ae

Signed-off-by: Ahmed Tiba <ahmed.tiba@arm.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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