Enable imported symbols allowlist

Change-Id: Idd7a3e98427efb2d422310d3a13252e8bbda6e36
diff --git a/src/intel/vulkan/BUILD.gn b/src/intel/vulkan/BUILD.gn
index f6a6e38..fb38dc9 100644
--- a/src/intel/vulkan/BUILD.gn
+++ b/src/intel/vulkan/BUILD.gn
@@ -39,6 +39,7 @@
 }
 
 magma_vulkan_icd("vulkan_intel") {
+  imported_symbols_allowlist = rebase_path("//src/graphics/lib/magma/gnbuild/imported_symbols.allowlist")
   output_name = "libvulkan_intel"
   deps = [
     ":vulkan_internal",