If the Orion WDT driver is built as a module, an opps occurs during
clk lookup when calling mvebu_clk_gating_get_src().  Remove the
inappropriate __init tag so the function is available for modules
after kernel init.
Signed-off-by: NJoshua Coombs <josh.coombs@gmail.com>
Signed-off-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NJason Cooper <jason@lakedaemon.net>