[ci] Fix the wrong build options issue (#7287)

Why I did it
Fix the wrong build options and improve display name for some tasks
1. Fix the wrong build architecture for arm64 and armhf
2. Fix the build timeout parameter

.azure-pipelines/azure-pipelines-build.yml

@@ -50,9 +50,9 @@ jobs:
           platform_rpc: centec
       - name: centec-arm64
         pool: sonicbld_8c
-        variables:
-          arch: arm64
         timeoutInMinutes: 1800
+        variables:
+          PLATFORM_ARCH: arm64
       - name: generic
         variables:
           dbg_image: true
@@ -61,9 +61,9 @@ jobs:
           swi_image: true
       - name: marvell-armhf
         pool: sonicbld_8c
-        variables:
-          arch: armhf
         timeoutInMinutes: 1800
+        variables:
+          PLATFORM_ARCH: armhf
       - name: mellanox
         variables:
           dbg_image: true
@@ -97,3 +97,4 @@ jobs:
             fi
             make $BUILD_OPTIONS target/sonic-$(GROUP_NAME).bin
           fi
+        displayName: "Build sonic image"

.azure-pipelines/azure-pipelines-image-template.yml

@@ -33,7 +33,7 @@ jobs:
             BUILD_OPTIONS="$(BUILD_OPTIONS) $CACHE_OPTIONS"
             echo "##vso[task.setvariable variable=BUILD_OPTIONS]$BUILD_OPTIONS"
           fi
-        displayName: "Make build options"
+        displayName: "Set cache options"
       - checkout: self
         submodules: recursive
         displayName: 'Checkout code'