net: ipa: don't return an error from ipa_interconnect_disable()
If disabling interconnects fails there's not a lot we can do. The
only two callers of ipa_interconnect_disable() ignore the return
value, so just give the function a void return type.
Print an error message if disabling any of the interconnects is not
successful. Return (and print) only the first error seen.
Signed-off-by: Alex Elder <elder@linaro.org> Signed-off-by: Jakub Kicinski <kuba@kernel.org>