linux-phytec-ti

mmc: host: omap_hsmmc: set clk rate to the max frequency

Set the clock rate of the functional clock to the max frequency
that is passed to the driver either using pdata or dt.

Also remove unnecessary setting of host->fclk to NULL.

This is in preparation for supporting high frequency modes
of operation.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>