maintainers: update GD32 paths

Some SoC/board files have been moved, use new paths.

Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>

MAINTAINERS.yml

@@ -2473,13 +2473,13 @@ GD32 Platforms:
  - gmarull
  - soburi
  files:
- - boards/arm/gd32*/
+ - boards/v2/gigadevice/
  - boards/riscv/gd32*/
  - boards/riscv/longan_nano/
  - drivers/*/*gd32*
  - dts/*/gigadevice/
  - dts/bindings/*/*gd32*
- - soc/arm/gigadevice/
+ - soc/v2/gigadevice/
  - soc/riscv/riscv-privileged/gd32vf103/
  - scripts/west_commands/*/*gd32*
  labels: