phy: sun4i: depend on RESET_CONTROLLER

The driver depend on the reset framework in a mandatory way. Make sure
reset_control_get is defined by adding this dependency in Kconfig

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>