feat(nxp-clk): get pll rate using get_module_rate

The DFS can use the get_module_rate instead of assuming its parent
object is a PLL. It also has the advantage that the frequency will be
returned based on the hardware state of the PLL module.

Change-Id: I3a270cbc92622ae82606382df1301597dc29782a
Signed-off-by: Ghennadi Procopciuc <ghennadi.procopciuc@nxp.com>
1 file changed