Use thiserror in pVM firmware.

Test: m pvmfw
Change-Id: Ib98435fadff21754166b9187941a3e2d265082e6

diff --git a/libs/libvmbase/Android.bp b/libs/libvmbase/Android.bp
index 3088633..d10642a 100644
--- a/libs/libvmbase/Android.bp
+++ b/libs/libvmbase/Android.bp
@@ -88,6 +88,7 @@
         "libsmccc",
         "libspin_nostd",
         "libstatic_assertions",
+        "libthiserror_nostd",
         "libtinyvec_nostd",
         "libuuid_nostd",
         "libvirtio_drivers",