Don't add .vendor suffix for vendor-only modules

Soong now adds .vendor suffix only for modules having both core and
vendor variants. Furthermore, names listed in LOCAL_SHARED_LIBRARIES
are correct (= have .vendor suffix when the dependent lib has variants).
Therefore, make does not need to force add .vendor suffix when parsing
modules from soong.

Bug: 37480243
Test: BOARD_VNDK_VERSION=current m -j <name> is successful, where <name>
is one of the vendor-only libraries in Soong. (i.e.
android.hardware.renderscript@1.0-impl)
Test: m -j does not break anything

Merged-In: Id8d0d01313c63496a10de4cd3ddb9f75180efef6
Change-Id: Id8d0d01313c63496a10de4cd3ddb9f75180efef6
(cherry picked from commit a9c4c717)