[GraphicsEnvironment] Add ld path for updatable driver.

BUG: 117241379
Test: Build, boot, flash and test with bionic PRINT output
Change-Id: If998ce152d207ec1be94405d93b7bd407eae136a
diff --git a/libs/graphicsenv/GraphicsEnv.cpp b/libs/graphicsenv/GraphicsEnv.cpp
index e53f7fd..024d72b 100644
--- a/libs/graphicsenv/GraphicsEnv.cpp
+++ b/libs/graphicsenv/GraphicsEnv.cpp
@@ -167,7 +167,7 @@
         auto sphalNamespace = android_get_exported_namespace("sphal");
         if (!sphalNamespace) return;
         mDriverNamespace = android_create_namespace("gfx driver",
-                                                    nullptr,             // ld_library_path
+                                                    mDriverPath.c_str(), // ld_library_path
                                                     mDriverPath.c_str(), // default_library_path
                                                     ANDROID_NAMESPACE_TYPE_SHARED |
                                                             ANDROID_NAMESPACE_TYPE_ISOLATED,