ARM: mvebu: a38x: use non-zero size for ddr scrubbing

Make ddr3_calc_mem_cs_size() global scope and use it in
ddr3_new_tip_ecc_scrub to correctly initialize all of DDR memory.

Signed-off-by: Chris Packham <judge.packham@gmail.com>
Signed-off-by: Stefan Roese <sr@denx.de>

drivers/ddr/marvell/a38x/mv_ddr_plat.c

@@ -995,7 +995,7 @@ static u32 ddr3_get_device_size(u32 cs)
 	}
 }
 
-static int ddr3_calc_mem_cs_size(u32 cs, uint64_t *cs_size)
+int ddr3_calc_mem_cs_size(u32 cs, uint64_t *cs_size)
 {
 	u32 cs_mem_size;