linux-phytec-fsl

MLK-13186-3 arm: clk: configure pcie ext osc clk

When the external oscillator is used as pcie ref clk.
the below configurations should done.
- set the lvds_clk1 as input
- set the source of the pll6_bypass to be lvds_clk1
- set the pll6 to be bypass mode.

Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>