net: ipa: use icc_enable() and icc_disable()

The interconnect framework now provides the ability to enable and
disable interconnects without having to change their recorded
"enabled" bandwidth value.  Use this mechanism, rather than setting
the bandwidth values to zero and non-zero respectively to disable
and enable the IPA interconnects.

Disable each interconnect before setting its "enabled" average and
peak bandwidth values.  Thereafter, enable and disable interconnects
when required rather than setting their bandwidths.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>