clk: qcom: rcg2: handle non-cxo frequency for enable_safe_config

There could be conditions where the RCG is configured and enabled for a
non-cxo frequency previous to HLOS. Check the condition during recalc
and update the current frequency with the actual frequency.

Change-Id: I9539f2bfe16378085ccdb06c32a4ea2c3bdfb456
Signed-off-by: Taniya Das <tdas@codeaurora.org>