clk: k6x: Enable High Speed RUN (HSRUN) mode for K66F SOC

The NXP's Kinetics K66F is able to run with max frequency of 180MHz.
To achieve this goal the SMC's PMPROT and PMCTRL registers need to be
adjusted.

On the contrary the K64F doesn't support HSRUN run mode.

Signed-off-by: Lukasz Majewski <lukma@denx.de>