msm: ipa3: get ipa clk for issuing uc cmds

Get the ipa-clk for ipa-uc to be able to read
/write ipa-registers when issuing uc commands.

Change-Id: Ie538501674804328f0d36181e38c7d3f947b6cf5
Signed-off-by: Skylar Chang <chiaweic@codeaurora.org>