linux-imx

clk: keystone: sci-clk: split out the fw clock parsing to own function

This makes it both easier to see what the probe does, and also makes it
possible to add alternative implementations for the clock data source.

Acked-by: Santosh Shilimkar <ssantosh@kernel.org>
Signed-off-by: Tero Kristo <t-kristo@ti.com>