arm64: mvebu: incorrect check of fdt address cells

In dram_init_banksize there seems to be a typo concerning
a plausibility check of the fdt.
Testing sc > 2 twice does not make any sense.

The problem was indicated by cppcheck.
Signed-off-by: NHeinrich Schuchardt <xypron.glpk@gmx.de>

arch/arm/mach-mvebu/arm64-common.c

@@ -94,7 +94,7 @@ int dram_init_banksize(void)
 
 	ac = fdt_address_cells(fdt, 0);
 	sc = fdt_size_cells(fdt, 0);
-	if (ac < 1 || sc > 2 || sc < 1 || sc > 2) {
+	if (ac < 1 || ac > 2 || sc < 1 || sc > 2) {
 		printf("invalid address/size cells\n");
 		return -ENXIO;
 	}