edk2: add secure boot variant to aarch64 firmware

pc-bios/meson.build

@@ -2,6 +2,7 @@ roms = []
 if unpack_edk2_blobs
   fds = [
     'edk2-aarch64-code.fd',
+    'edk2-aarch64-secure-code.fd',
     'edk2-arm-code.fd',
     'edk2-arm-vars.fd',
     'edk2-i386-code.fd',