Don't embed vendor libs into vendor apks.

Vendor apk can now access /vendor/lib. So there is no need for us to
embed the vendor libs into vendor apks. Reverting the old commits.

Revert "Embedding the JNI lib is controlled by PRODUCT_FULL_TREBLE"
This reverts commit a6b038ff.

Revert "Embed jni libs in vendor apks for treble-ized devices"
This reverts commit 1cb8dea6.

Bug: 69272876
Test: m -j ModemDiagnosticSystem (a vendor apk having JNI libs in walleye)
unzip -l /vendor/app/ModemDiagnosticSystem/ModemDiagnosticSystem.apk does not
have libmdsdiag.so in it. The so file is found in /vendor/lib64.

Change-Id: I7b96aa56b39bc45aca4810e6fb3f41ce2a1fc095