Remove temporary 'vendor_api_level_of' function from init and replace
the function with the same in libvendorsupport.
Bug: 312403948
Test: getprop ro.vendor.api_level
Change-Id: I095353e602397220571e131431e7cbd1b8511fa6
Merged-In: I095353e602397220571e131431e7cbd1b8511fa6
The library provides mapping functions between SDK versions and
vendor api levels.
Bug: 315056516
Test: atest libvendorsupport-tests
Change-Id: I4a4eae0456ebf756badcc80f09a2946f741843c5