msm: ipa: add clock scaling support to IPA driver

Add implementation of internal API for scaling IPA clocks
depends on floor voltage and bandwidth required.
This API is called from IPA RM.

Change-Id: I181c0c5294a03008ff586fe37ed2b1889fbbfe09
Acked-by: Ady Abraham <adya@qti.qualcomm.com>
Signed-off-by: Gidon Studinski <gidons@codeaurora.org>