ARM: rockchip: fix copy'n'paste error in smp error messages

The error emitted when mapping the pmu failed, wrongly mentions the sram.
Reported-by: NKent Borg <kentborg@borg.org>
Signed-off-by: NHeiko Stuebner <heiko@sntech.de>

arch/arm/mach-rockchip/platsmp.c

@@ -152,7 +152,7 @@ static void __init rockchip_smp_prepare_cpus(unsigned int max_cpus)
 
 	node = of_find_compatible_node(NULL, NULL, "rockchip,rk3066-pmu");
 	if (!node) {
-		pr_err("%s: could not find sram dt node\n", __func__);
+		pr_err("%s: could not find pmu dt node\n", __func__);
 		return;
 	}