mmc: dw_mmc: do not skip dwmci_setup_bus() for same non-zero clock frequency

mmc: dw_mmc: do not skip dwmci_setup_bus() for same non-zero clock frequency

In dwmci_setup_bus(), if the requested frequency is equal to the current
frequency, the function is returned, assuming no changes are required in
associated registers.

On certain SD cards, skipping in such situations may result in a timeout
errors during MMC initialization. Due to the lack of documentation, the
cause is unknown, but removing said check seems to fix the issue.

Signed-off-by: Kaustabh Chakraborty <kauschluss@disroot.org>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>