cnss2: Use CONFIG_INTERCONNECT to protect icc related APIs

This makes sure CNSS2 driver is able to work in the platforms and
kernels which do not have on-chip interconnect management feature.

Change-Id: I282ef1a282fab9ce4910e7ab914f26789b34ba64
Signed-off-by: Yue Ma <yuem@codeaurora.org>