Revert "Don't install files for the virt APEX onto the system partition"

This reverts commit 1908108ac2.

Reason for revert: b/207783530

Change-Id: Id70acc1090fb547c59f8064d525992d57b5e069e

apex/Android.bp

@@ -16,9 +16,6 @@ apex {
     // TODO(jiyong): make it updatable
     updatable: false,
     platform_apis: true,
-    // b/207336449: this is to turn the symlink optimization off while keeping this APEX
-    // non-updatable. Can be removed when `updatable` becomes true.
-    installable: false,
 
     system_ext_specific: true,
 

apex/product_packages.mk

@@ -25,6 +25,7 @@ PRODUCT_PACKAGES += \
 
 # TODO(b/207336449): Figure out how to get these off /system
 PRODUCT_ARTIFACT_PATH_REQUIREMENT_ALLOWED_LIST := \
+    system/lib64/libgfxstream_backend.so \
     system/framework/oat/%@service-compos.jar@classes.odex \
     system/framework/oat/%@service-compos.jar@classes.vdex \