usb: host: ohci-generic: Make usage of clock/reset bulk() API

Make usage of clock and reset bulk API in order to simplify the code

Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Reviewed-by: Xavier Drudis Ferran <xdrudis@tinet.cat>