ARM: dts: DRA74x: fix DSS PLL2 addresses

DSS's 'pll2_clkctrl' and 'pll2' have wrong addresses in the dra74x.dtsi
file. Video PLL2 has not been used so wrong addresses went unnoticed.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>