ARM: dts: imx25/karo-tx25: Replace NO_PAD_CTL by explicit pad configuration

Instead of using 0x80000000 explicitly specify the reset defaults for
the pad settings. This way the pad configuration is explicit and so
isn't affected by changes that might have been done in the bootloader.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>