lib: smc: Rename macro for extended args count am: 26df3487fa

Original change: https://android-review.googlesource.com/c/trusty/lk/trusty/+/3516010

Change-Id: Ibca72fa96af0657a8d0800f83b58e180d1052269
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>