ARM: dts: imx25-pinfunc: Move MX25_PAD_TDO__TDO to a more sensible place

The pinfunc definitions are ordered by mux_reg and so automatically by
conf_reg, too. PAD_TDO is the only pad that has a conf_reg but no
mux_reg. Put it to the place where it its in the order of conf_regs
instead of the top.

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