powerpc/km82xx: rename mgcoge files to km82xx

The directory and file mgcoge was renamed to km82xx.
Because other keymile 82xx will follow and will use the
same platform code.

Signed-off-by: Holger Brunck <holger.brunck@keymile.com>
Acked-by: Heiko Schocher <hs@denx.de>
cc: Wolfgang Denk <wd@denx.de>
cc: Detlev Zundel <dzu@denx.de>
cc: Valentin Longchamp <valentin.longchamp@keymile.com>
Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com>

boards.cfg

@@ -439,8 +439,8 @@ PQ2FADS-ZU_66MHz             powerpc     mpc8260     mpc8260ads          freesca
 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     -                   keymile
-mgcoge2ne                    powerpc     mpc8260     mgcoge              keymile
+mgcoge                       powerpc     mpc8260     km82xx              keymile
+mgcoge2ne                    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