Updatable Driver: Decouple gfx_driver from sphal

This change manually constructs updatable graphics driver namespace
without inheriting from sphal namespace. Manually link against default
namespace to access llndk libraries and link against vndk namespace to
access vndksp libraries. Then the newly created namespace will not have
access to libraries under /vendor/lib[64]/.

Bug: 120106759
Test: Manual. Install updatable driver apk with/without some missing
libraries to verify the namespace isolation working as intended.
Change-Id: I6225bb018028bbb72f77b288c3b5bf60a5b86422
Merged-In: I6225bb018028bbb72f77b288c3b5bf60a5b86422