arm, imx6: aristainetos board updates

some small updates for the aristainetos boards:
- fix display timings for the aristainetos board
- fix pinmux for the aristainetos board
- fix pinmux for the aristainetos2 board
- fix default environment

Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/include/configs/aristainetos-common.h b/include/configs/aristainetos-common.h
index 4a5d4fb..30d903e 100644
--- a/include/configs/aristainetos-common.h
+++ b/include/configs/aristainetos-common.h
@@ -106,7 +106,7 @@
 	"ubiboot=echo Booting from ubi ...; " \
 		"run ubiargs addmtd addmisc set_fit_default;" \
 		"bootm ${fit_addr_r}\0" \
-	"ubifs_load_fit=sf probe;ubi part ubi 2048;ubifsmount ubi:rootfs;" \
+	"ubifs_load_fit=sf probe;ubi part ubi 4096;ubifsmount ubi:rootfs;" \
 		"ubifsload ${fit_addr_r} /boot/system.itb; " \
 		"imi ${fit_addr_r}\0 " \
 	"rescueargs=setenv bootargs console=${console},${baudrate} " \