Cherry-pick changes from master

* phoenix-rtos-build 27278d1...8658e67 (3):
  > toolchain: fix arm cortex subvariant check
  > toolchain: fix arm cortex subvariant check
  > toolchain: fix arm crtstuff .data in PIC mode

* phoenix-rtos-devices 3b4a2ab...9fa3d94 (5):
  > stm32l4-multi: handle dma TC and HT in single callback
  > stm32l4-multi: disable RXNE interrupt when using DMA
  > stm32l4-multi/libuart: disable DMA channel when reconfiguring UART
  > stm32l4-multi/libuart: refactor
  > stm32l4-multi/libuart: fix initialization order

Release 3.2.1

Release 3.2.0

Submodule update

* libphoenix bea8eb5...90d2bf0 (2):
  > math: Fix sqrt hw calculation on IA32
  > riscv64: load args to main in _start

* phoenix-rtos-build 77ee698...6fcb417 (2):
  > scripts: remove unused mkimg scripts
  > scripts/gr716-convert.py: add executable permission

* phoenix-rtos-doc 42c1aa9...d5b87e6 (3):
  > building: simplify instructions for macOS
  > building: remove binutils installation on macOS
  > doc: correct markdown issues

* phoenix-rtos-kernel bbdfbda...6f8ab7e (9):
  > Bump version to 3.0
  > Update supported targets list
  > Fix makefile description headers
  > NOMMU/vm_mapDestroy: Remove only entries associated with the map
  > riscv64: make hal_jmp consistent with other targets
  > threads: reduce number of lock on threads_common.spinlock
  > Apply MISRA to syscalls.c
  > process: Fix warning
  > process_load: fix 64-bit elf validation

* plo 4b1402a...8b999ce (2):
  > ia32: add support for tab character in tty-bios
  > sparcv8leon3: add hal_cpu*Barrier functions