clk: actions: owl-divider: convert from divider_round_rate() to divider_determine_rate()

clk: actions: owl-divider: convert from divider_round_rate() to divider_determine_rate()

The divider_round_rate() function is now deprecated, so let's migrate
to divider_determine_rate() instead so that this deprecated API can be
removed. Additionally, owl_divider_helper_round_rate() is no longer used,
so let's drop that from the header file as well.

Note that when the main function itself was migrated to use
determine_rate, this was mistakenly converted to:

    req->rate = divider_round_rate(...)

This is invalid in the case when an error occurs since it can set the
rate to a negative value.

Fixes: 1b04e12a8bcc ("clk: actions: owl-divider: convert from round_rate() to determine_rate()")
Acked-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Brian Masney <bmasney@redhat.com>