Apks are again allowed to use vendor libs as before

When BOARD_VNDK_VERSION is set, native libs that were labeled as
native:platform are now divided into native:platform and native:vendor
sets depending on their install locations. In order to keep the existing
apks to use all the libraries that they have been using, native:vendor
is also added to the allowed types for apks.

However, in the future when we have vendor SDK and enforce all vendor
apks to use the vendor SDK, we will disallow native:vendor to
app:platform and native:vendor will be allowed only to those vendor apks
(probably labeled as app:vendor).

Bug: 33241851
Test: BOARD_VNDK_VERSION=current m <a vendor lib using vendor jni>
(e.g. ModemDiagnosticSystem in internal master)

Change-Id: I6ad0967ab17f07be9657b58c20fa9b96bd1a342b
Merged-In: I6ad0967ab17f07be9657b58c20fa9b96bd1a342b