boards.cfg: fix a configuration error of ep8248 board

"make ep8248_config" fails with an error like this:

    $ make ep8248_config
    make: *** [ep8248_config] Error 1

Its cause is that there are two entries for "ep8248".

The first is around line 652 of boards.cfg. (as Active)

The second appears around line 1230. (as Orphan)

This bug was accidentally introduced by commit e7e90901.
But it is not the author's fault. He just intended to change
IDS8247 board.

The commiter added ep8248 entry by mistake when he resolved a conflict.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Heiko Schocher <hs@denx.de>
Cc: Kim Phillips <kim.phillips@linaro.org>
Acked-by: Heiko Schocher <hs@denx.de>
Acked-by: Kim Phillips <kim.phillips@freescale.com>
diff --git a/boards.cfg b/boards.cfg
index 9fa01a2..3a59686 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -652,7 +652,6 @@
 Active  powerpc     mpc8260        -           -               cpu86               CPU86_ROMBOOT                         CPU86:BOOT_ROM                                                                                                                    Wolfgang Denk <wd@denx.de>
 Active  powerpc     mpc8260        -           -               cpu87               CPU87                                 -                                                                                                                                 -
 Active  powerpc     mpc8260        -           -               cpu87               CPU87_ROMBOOT                         CPU87:BOOT_ROM                                                                                                                    -
-Active  powerpc     mpc8260        -           -               ep8248              ep8248                                -                                                                                                                                 Yuli Barcohen <yuli@arabellasw.com>
 Active  powerpc     mpc8260        -           -               iphase4539          IPHASE4539                            -                                                                                                                                 Wolfgang Grandegger <wg@denx.de>
 Active  powerpc     mpc8260        -           -               muas3001            muas3001                              -                                                                                                                                 Heiko Schocher <hs@denx.de>
 Active  powerpc     mpc8260        -           -               muas3001            muas3001_dev                          muas3001:MUAS_DEV_BOARD                                                                                                           Heiko Schocher <hs@denx.de>