OPP: Rearrange entries in pm_opp.h

[ Upstream commit 754833b3 ]

Rearrange the helper function declarations / definitions to keep them in
order of freq, level and then bw.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Stable-dep-of: b44b9bc7cab2 ("OPP: fix dev_pm_opp_find_bw_*() when bandwidth table not initialized")
Signed-off-by: Sasha Levin <sashal@kernel.org>