Rollup merge of #135757 - no1wudi:master, r=compiler-errors

Add NuttX support for AArch64 and ARMv7-A targets

This patch adds tier 3 support for AArch64 and ARMv7-A targets in NuttX, including:
- AArch64 target: aarch64-unknown-nuttx
- ARMv7-A target: armv7a-nuttx-eabi, armv7a-nuttx-eabihf
- Thumbv7-A target: thumbv7a-nuttx-eabi, thumbv7a-nuttx-eabihf

Author: matthiaskrgr