powerpc/km82xx: add mgcoge3ne and remove mgcoge2ne support

This patch adds support for the MPC8247 based board mgcoge3ne.
Additionaly mgcoge2ne board supprot was removed, because due
to the mgcoge3ne, this board is obsolete and not longer
maintained.
The board is similar to mgcoge. The difference is that
a NUMONYX flash is used and a different SDRAM (256MB).
Also introduce CONFIG_KM_82XX to collect ppc82xx common
settings and remove staticness from the common set_pin function.

Signed-off-by: Holger Brunck <holger.brunck@keymile.com>
Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com>
Acked-by: Heiko Schocher <hs@denx.de>
cc: Wolfgang Denk <wd@denx.de>
cc: Detlev Zundel <dzu@denx.de>
diff --git a/boards.cfg b/boards.cfg
index e0791fe..f0d3440 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -440,7 +440,7 @@
 PQ2FADS-ZU_lowboot           powerpc     mpc8260     mpc8260ads          freescale      -           MPC8260ADS:ADSTYPE=CONFIG_SYS_PQ2FADS,SYS_TEXT_BASE=0xFF800000
 VoVPN-GW_66MHz               powerpc     mpc8260     vovpn-gw            funkwerk       -           VoVPN-GW:CLKIN_66MHz
 mgcoge                       powerpc     mpc8260     km82xx              keymile
-mgcoge2ne                    powerpc     mpc8260     km82xx              keymile
+mgcoge3ne                    powerpc     mpc8260     km82xx              keymile
 SCM                          powerpc     mpc8260     -                   siemens
 TQM8255_AA                   powerpc     mpc8260     tqm8260             tqc            -           TQM8260:MPC8255,300MHz
 TQM8260_AA                   powerpc     mpc8260     tqm8260             tqc            -           TQM8260:MPC8260,200MHz