lopper: assists: gen_domain_dts: Add zephyr dt support for A53 and R5 processor for ZynqMP

[kedareswararao]

Add zephyr device tree generation support for Cortex-A53 (APU) and Cortex-R5 (RPU) processors when targeting Zephyr on AMD ZynqMP platforms.

• Gate the ARM zephyr-dt path on "a53" in addition to the existing r52/a78/a72/r5 checks.
• Emit an "arm,psci-0.2" PSCI node for A53 (ZynqMP's TF-A advertises PSCI 0.2, unlike Versal's psci-1.1).
• Rebuild the GIC node for A53 (xlnx,ip-name "psu_acpu_gic") as "arm,gic-400"/"arm,gic-v2" at /axi/interrupt-controller@f9010000, and extend the existing R5 GIC branch to also match ZynqMP's "psu_rcpu_gic" ip-name (same "arm,gic-v1" compatible already used for Versal R5).
• Broaden the two Versal-only 'psv_cortexr5' exact-match checks (armv8 timer deletion, TTC -> xlnx,ttcps conversion) so they also match ZynqMP's R5 machine string.
• Add "arm,cortex-a53" and "arm,gic-400" required-prop entries to zephyr_supported_comp.yaml.