[dab][for-4.0.2] Fix kernel-devsrc build

agl-demo-platform-crosssdk install kernel-devsrc (formerly kernel-dev) .

For dra7xx-evm, we need to fix the patch of 'awk' in the kernel's help scripts to point to /usr/bin/awk instead of /bin/awk. This fixes an rpm dependency check when constructing the final image as we don't ship /bin/awk in the rootfs.

m3/h3 (+porter) affected, too.