Add clk driver for i.MX8QXP. This basic version supports clk
enable/disable/get_rate/set_rate operations for I2C, ENET,
SDHC0 and UART clocks.
Signed-off-by: NPeng Fan <peng.fan@nxp.com>
Signed-off-by: NAnatolij Gustschin <agust@denx.de>
Cc: Stefano Babic <sbabic@denx.de>