staging: dwc2: remove unneeded check

The value in params->enable_dynamic_fifo can only be true if the
corresponding bit in hwcfg2 is set, this is already checked by
dwc2_set_param_enable_dynamic_fifo.

Signed-off-by: Matthijs Kooijman <matthijs@stdin.nl>
Acked-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>