powerpc/82xx: merge mgcoge.h and mgcoge3ne.h into km82xx.h

Since mgcoge and mgcoge3ne are the only km82xx boards, there is no need
to keep them as separate .h config files.
Therefore, make mgcoge3ne.h and mgcoge.h converge into a single km82xx.h
file.

Signed-off-by: Gerlando Falauto <gerlando.falauto@keymile.com>
diff --git a/boards.cfg b/boards.cfg
index 2d36d83..1af87c0 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -577,8 +577,8 @@
 PQ2FADS-ZU_66MHz_lowboot     powerpc     mpc8260     mpc8260ads          freescale      -           MPC8260ADS:ADSTYPE=CONFIG_SYS_PQ2FADS,8260_CLKIN=66000000,SYS_TEXT_BASE=0xFF800000
 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
-mgcoge3ne                    powerpc     mpc8260     km82xx              keymile
+mgcoge                       powerpc     mpc8260     km82xx              keymile        -           km82xx:MGCOGE
+mgcoge3ne                    powerpc     mpc8260     km82xx              keymile        -           km82xx:MGCOGE3NE
 SCM                          powerpc     mpc8260     -                   siemens
 TQM8255_AA                   powerpc     mpc8260     tqm8260             tqc            -           TQM8260:MPC8255,300MHz
 TQM8260_AA                   powerpc     mpc8260     tqm8260             tqc            -           TQM8260:MPC8260,200MHz