msm: pil-riva: Rename riva pas id to generic wcnss pas id

In secure PIL, PAS_RIVA is passed to scm-pas call as the identification of
wireless connectivity subsystem (wcnss). However, new name has been used on
newer targets. For example, on 8974, the name of wcnss is Pronto. So make
the pas id name generic for wcnss.

Change-Id: I7caa76adc76dd2d20ff7aedabd4935437b012a92
Signed-off-by: Tianyi Gou <tgou@codeaurora.org>