Add llndk_library for libvulkan

This commit adds a llndk_library module definition for libvulkan so
that vendor modules can depend on libvulkan (like libGLESv2).

Bug: 72426809
Test: lunch aosp_walleye-userdebug && make -j8

Merged-In: I78d756fc6915fed06ba4c8998ef67f44c668f1c1
Change-Id: I78d756fc6915fed06ba4c8998ef67f44c668f1c1
(cherry picked from commit 8a6aea25)