ARM: dts: msm: Add wdi to ipa_pm exception list

Add the ipa_pm exception list for wdi
client to change the ipa-hw clock-voting
for wlan-driver.

Change-Id: Ideefda6fd92aa22e9e9a0d849c6e853537473476
Signed-off-by: Skylar Chang <chiaweic@codeaurora.org>