[ci]: use native arm64 and armhf pool (sonic-net#2013)

Signed-off-by: Guohan Lu <[email protected]>

Author: lguohan

.azure-pipelines/build-template.yml

@@ -11,6 +11,8 @@ parameters:
   type: string
   values:
   - sonicbld
+  - sonicbld-armhf
+  - sonicbld-arm64
   - default
   default: default
 

azure-pipelines.yml

@@ -32,7 +32,7 @@ stages:
     parameters:
       arch: armhf
       timeout: 240
-      pool: sonicbld
+      pool: sonicbld-armhf
       sonic_slave: sonic-slave-buster-armhf
       buildimage_artifact_name: sonic-buildimage.marvell-armhf
       buildimage_pipeline: 141
@@ -45,7 +45,7 @@ stages:
     parameters:
       arch: arm64
       timeout: 240
-      pool: sonicbld
+      pool: sonicbld-arm64
       sonic_slave: sonic-slave-buster-arm64
       swss_common_artifact_name: sonic-swss-common.arm64
       buildimage_artifact_name: sonic-buildimage.centec-arm64