liblibfdt: Add no_std variant for libfdt_baremetal

Add a second rlib that wraps the newly-created libfdt_baremetal
cc_library to ensure that baremetal clients (using the *_nostd library
variants) don't use the non-_baremetal C library. This allows baremetal
code to be compiled with a different set of Clang flags.

Test: m pvmfw
Change-Id: I71b50eeafe257fa6086805ca5a6b4c0de935bb32
diff --git a/libs/libvmbase/Android.bp b/libs/libvmbase/Android.bp
index ee12e85..e634c18 100644
--- a/libs/libvmbase/Android.bp
+++ b/libs/libvmbase/Android.bp
@@ -81,7 +81,7 @@
         "libbuddy_system_allocator",
         "libcstr",
         "libfdtpci",
-        "liblibfdt",
+        "liblibfdt_nostd",
         "liblog_rust_nostd",
         "libonce_cell_nostd",
         "libsmccc",