Remove libavservices_minijail_vendor

By adding "vendor_available: true" to "libavservices_minijail", we
don't need to have "libavservices_minijail_vendor" any longer.
Replacing all "libavservices_minijail_vendor" with
"libavservices_minijail", "libavservices_minijail_vendor" is not
required.

Bug: 146313710
Test: m
Change-Id: I808e4a31b1f2f914e64ba6495a6eb53eefc7c022