clock-gcc-8994: Change the halt check type for PCIE clocks

PCIE pipe clocks have external sources. Due to HW design, there is no
guarantee that 1) the downstream branch clocks are turned on after
turning on the sources; 2) the downstream branch clocks are turned off
before turning off the sources.

Therefore, make the halt check for these clocks as delay instead of
polling the status bit to avoid warnings.

Change-Id: I7f69ce51db761d364a0909ff5df57117332500df
Signed-off-by: Junjie Wu <junjiew@codeaurora.org>