clk: sunxi: h6_r: Correct the driver name

H6 is from the sun50i family, not sun6i.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>