rcar_gen3: plat: Change periodic write DQ training option.

Periodic write DQ training available as default.
Signed-off-by: Toshiyuki Ogasahara <toshiyuki.ogasahara.bo@hitachi.com>
Signed-off-by: Yoshifumi Hosoya <yoshifumi.hosoya.wj@renesas.com>
Change-Id: I649cfe538e4e2c7e19145ce7d1938ce4361b2529

plat/renesas/rcar/platform.mk

@@ -265,7 +265,7 @@ $(eval $(call add_define,RCAR_REF_INT))
 
 # Process RCAR_REWT_TRAINING flag
 ifndef RCAR_REWT_TRAINING
-RCAR_REWT_TRAINING := 0
+RCAR_REWT_TRAINING := 1
 endif
 $(eval $(call add_define,RCAR_REWT_TRAINING))