MAINTAINERS: nxp-mpu: add more collaborators

Add yangbolu1991 and Zhiqiang-Hou as the collaborators for NXP MPU,
yangbolu1991 has contributed a lot of in scope of MPU M-core and
Zhiqiang-Hou has contributed a lot of in scope of MPU A-Core, they
could help to fast the review process.

Signed-off-by: Jiafei Pan <Jiafei.Pan@nxp.com>

Author: JiafeiPan

MAINTAINERS.yml

@@ -3918,6 +3918,8 @@ NXP Platforms (MPU):
     - dleach02
     - dbaluta
     - iuliana-prodan
+    - yangbolu1991
+    - Zhiqiang-Hou
   files:
     - dts/arm64/nxp/
     - dts/arm/nxp/nxp_imx*