imx6: tqma6: use lower driver stength for I2C pins

The current driver stength is too high, leading to spec violations
on the falling edge. Fix it with values from HW

Signed-off-by: Markus Niebel <Markus.Niebel@tq-group.com>
diff --git a/board/tqc/tqma6/tqma6_mba6.c b/board/tqc/tqma6/tqma6_mba6.c
index 4db1a0b..af92967 100644
--- a/board/tqc/tqma6/tqma6_mba6.c
+++ b/board/tqc/tqma6/tqma6_mba6.c
@@ -51,7 +51,7 @@
 	PAD_CTL_DSE_80ohm | PAD_CTL_SRE_FAST | PAD_CTL_HYS)
 
 #define I2C_PAD_CTRL	(PAD_CTL_PUS_100K_UP | PAD_CTL_SPEED_MED | \
-	PAD_CTL_DSE_40ohm | PAD_CTL_HYS |			\
+	PAD_CTL_DSE_80ohm | PAD_CTL_HYS |			\
 	PAD_CTL_ODE | PAD_CTL_SRE_FAST)
 
 #if defined(CONFIG_MX6Q)