msm: kgsl: Add a new marker for IFPC

The SET_MARKER packet is intended to be used for
preemption. Since we also need markers for IFPC,
add those as a separate marker. Also, make sure
the old way still works for firmware versions
that need it.

Change-Id: I35bf0b0745e1f9efff08f876d84e35521a68bd7a
Signed-off-by: Kyle Piefer <kpiefer@codeaurora.org>