Add Ciborium to pvmfw

Import Ciborium to enable us to validate & manipulate the BCC CBOR.

Initially we do very minimal verification, just to prove that we can
call into the crate.

Bug: 266172411
Test: atest MicrodroidTests
Change-Id: Iaa78f9fc4f9b5c32e26c54eafc45bf5b29046f1e
diff --git a/pvmfw/Android.bp b/pvmfw/Android.bp
index 7ea1189..0ae2203 100644
--- a/pvmfw/Android.bp
+++ b/pvmfw/Android.bp
@@ -17,6 +17,8 @@
         "libaarch64_paging",
         "libbssl_ffi_nostd",
         "libbuddy_system_allocator",
+        "libciborium_nostd",
+        "libciborium_io_nostd",
         "libdiced_open_dice_nostd",
         "libfdtpci",
         "libhyp",