librust_baremetal: Use cc_baremetal_defaults

Use the library to share configuration with other baremetal targets.

Test: m pvmfw
Change-Id: Idbcbffa1cfdc9b1408695396600702241de1eadf
diff --git a/libc/Android.bp b/libc/Android.bp
index eeea728..8e1ddfc 100644
--- a/libc/Android.bp
+++ b/libc/Android.bp
@@ -2166,6 +2166,7 @@
 //     async_safe_fatal_va_list
 cc_library_static {
     name: "librust_baremetal",
+    defaults: ["cc_baremetal_defaults"],
     header_libs: ["libc_headers"],
     include_dirs: [
         "bionic/libc/async_safe/include",