rcar_gen3: E3 target: fix compilation issues

Target builds but has not been tested.

Signed-off-by: ldts <jorge.ramirez.ortiz@gmail.com>
diff --git a/drivers/staging/renesas/rcar/ddr/ddr_a/ddr_init_e3.h b/drivers/staging/renesas/rcar/ddr/ddr_a/ddr_init_e3.h
index b202b02..115765b 100644
--- a/drivers/staging/renesas/rcar/ddr/ddr_a/ddr_init_e3.h
+++ b/drivers/staging/renesas/rcar/ddr/ddr_a/ddr_init_e3.h
@@ -24,7 +24,7 @@
    #endif
 #endif
 
-extern int32_t InitDram(void);
+extern int32_t rcar_dram_init(void);
 #define INITDRAM_OK (0)
 #define INITDRAM_NG (0xffffffff)
 #define INITDRAM_ERR_I (0xffffffff)