Allow VNDK-SP extensions to use vendor lib

This commit adds a wildcard linker namespace link between the "vndk"
namespace and the "sphal" namespace of the system processes.  This is
created for VNDK-SP-Ext to load vendor libs in "sphal" namespace.

Bug: 77249955
Test: lunch aosp_walleye-userdebug && make -j8  # runs unit tests
Test: lunch aosp_sailfish-userdebug && make -j8  # runs unit tests
Test: Create a VNDK-SP-Ext, link to vendor libs, and run it.
Change-Id: I71b0fb604a84272156aa119130c272f891847008