ARM i.MX53: Fix PLL4 base address

commit cdd781ab1906d039c2a93078385645d2d5af8491 upstream.

MX53_DPLL4_BASE accidently returned the base address of PLL3.
Fix this.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>