msm: board-8960: Don't add modem devices on APQ targets

An APQ8060A device doesn't have a modem processor so don't add
the pil devices if we're running on that SoC.

Change-Id: Ic569fb15c138a2083c38344a695073229665ec12
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>