[Ci] Fix the wrong SONIC_BUILD_JOBS build variable used issue in Azp (#14071)

Why I did it
[Ci] Fix the no parallel jobs in some of the platforms issue
We observed some of the pipelines running more time than expected. The issue is the SONIC_BUILD_JOBS using the wrong value 1. It is caused by the runtime variable issue, there is additional single quota mark character added in the make command line.

make 'SONIC_BUILD_JOBS=$(nproc)' targe/xxxx
Need to change to

make SONIC_BUILD_JOBS=$(nproc) targe/xxxx
It is to improve the build performance for some of the platforms using the variable SONIC_BUILD_JOBS=1.
Good one vs: https://dev.azure.com/mssonic/build/_build/results?buildId=227986&view=logs&j=cef3d8a9-152e-5193-620b-567dc18af272&t=cf595088-5c84-5cf1-9d7e-03331f31d795

"SONIC_BUILD_JOBS"                : "8"
Bad one barefoot: https://dev.azure.com/mssonic/build/_build/results?buildId=227379&view=logs&j=993d6e22-aeec-5c03-fa19-35ecba587dd9&t=7be0d2ec-661f-5569-462c-2d9b7ca4ca5d

"SONIC_BUILD_JOBS"                : "1"
How I did it
Expand the BUILD_OPTIONS variable for all platforms.

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

@@ -28,11 +28,12 @@ jobs:
       - template: .azure-pipelines/cleanup.yml@buildimage
       - ${{ parameters.preSteps }}
       - script: |
+          BUILD_OPTIONS="$(BUILD_OPTIONS)"
           if [ -n "$(CACHE_MODE)" ] && echo $(PLATFORM_AZP) | grep -E -q "^(vs|broadcom|mellanox|marvell-armhf)$"; then
             CACHE_OPTIONS="SONIC_DPKG_CACHE_METHOD=$(CACHE_MODE) SONIC_DPKG_CACHE_SOURCE=/nfs/dpkg_cache/$(PLATFORM_AZP)"
             BUILD_OPTIONS="$(BUILD_OPTIONS) $CACHE_OPTIONS"
-            echo "##vso[task.setvariable variable=BUILD_OPTIONS]$BUILD_OPTIONS"
           fi
+          echo "##vso[task.setvariable variable=BUILD_OPTIONS]$BUILD_OPTIONS"
         displayName: "Set cache options"
       - checkout: self
         submodules: recursive