uboot-imx

MLK-16118-7 spi: flexspi: Add init_clk_fspi function to setup clock

When the power domain driver is enabled, we need to enable clocks after power
domain on. The clock settings in board level codes must be removed, needs to
set them when the device is probed. Add this weak function in flexspi driver,
that SoC codes can implement the clock settings.

Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Ye Li <ye.li@nxp.com>
(cherry picked from commit a4d334e70839021a50dca2ad4ad98ecee16081f9)
(cherry picked from commit 821d6b7b06cba244ac872a7b3af9ee269f464008)