powerpc/83xx/km: merge tuxa and tuda1 boards to tuxx1

These boards are from a u-boot point of view identical. So collect
the two headerfiles to one, to decrease maintenance.

Signed-off-by: Holger Brunck <holger.brunck@keymile.com>
cc: Valentin Longchamp <valentin.longchamp@keymile.com>
cc: Heiko Schocher <hs@denx.de>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
diff --git a/boards.cfg b/boards.cfg
index 0b32532..0eeb4c7 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -593,8 +593,7 @@
 kmeter1                      powerpc     mpc83xx     km83xx              keymile
 kmsupx5                      powerpc     mpc83xx     km83xx              keymile
 suvd3                        powerpc     mpc83xx     km83xx              keymile
-tuda1                        powerpc     mpc83xx     km83xx              keymile
-tuxa1                        powerpc     mpc83xx     km83xx              keymile
+tuxx1                        powerpc     mpc83xx     km83xx              keymile
 MERGERBOX                    powerpc     mpc83xx     mergerbox           matrix_vision
 MVBLM7                       powerpc     mpc83xx     mvblm7              matrix_vision
 SIMPC8313_LP                 powerpc     mpc83xx     simpc8313           sheldon        -           SIMPC8313:NAND_LP