Propagate sanitize.never flag in SDK snapshots.

This is necessary to not get dependencies on libclang_rt sanitizer libs
for the CRT objects which lead to cyclic dependencies in sanitizer
builds.

Test: `lunch aosp_blueline_hwasan-userdebug && m nothing`
  in a tree that has the prebuilts created and unzipped from
  `build/soong/scripts/build-aml-prebuilts.sh runtime-module-{sdk,host-exports}`
Bug: 151303681
Change-Id: I3f848a084280bdc3ade4b74df03e981d8cc61222

sdk/cc_sdk_test.go

@@ -340,6 +340,9 @@ func TestSnapshotWithObject(t *testing.T) {
 		cc_object {
 			name: "crtobj",
 			stl: "none",
+			sanitize: {
+				never: true,
+			},
 		}
 	`)
 
@@ -352,6 +355,9 @@ cc_prebuilt_object {
     sdk_member_name: "crtobj",
     stl: "none",
     compile_multilib: "both",
+    sanitize: {
+        never: true,
+    },
     arch: {
         arm64: {
             srcs: ["arm64/lib/crtobj.o"],
@@ -367,6 +373,9 @@ cc_prebuilt_object {
     prefer: false,
     stl: "none",
     compile_multilib: "both",
+    sanitize: {
+        never: true,
+    },
     arch: {
         arm64: {
             srcs: ["arm64/lib/crtobj.o"],