rockchip: clk: rk3399: add clock support for SCLK_SPI1 and SCLK_SPI5

rockchip: clk: rk3399: add clock support for SCLK_SPI1 and SCLK_SPI5

This change adds support for configuring the module clocks for SPI1 and
SPI5 from the 594MHz GPLL.

Note that the driver (rk_spi.c) always sets this to 99MHz, but the
implemented functionality is more general and will also support
different clock configurations.

X-AffectedPlatforms: RK3399-Q7
Signed-off-by: Philipp Tomsich <[email protected]>
Tested-by: Jakob Unterwurzacher <[email protected]>
Tested-by: Klaus Goger <[email protected]>
Acked-by: Simon Glass <[email protected]>