MX5: drop config.mk from efikamx board

Signed-off-by: Stefano Babic <sbabic@denx.de>
CC: Marek Vasut <marek.vasut@gmail.com>
diff --git a/boards.cfg b/boards.cfg
index 5f7d69a..f6e5b71 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -126,7 +126,7 @@
 edminiv2                     arm         arm926ejs   -                   LaCie          orion5x
 dkb			     arm         arm926ejs   -                   Marvell        pantheon
 ca9x4_ct_vxp                 arm         armv7       vexpress            armltd
-efikamx                      arm         armv7       efikamx             -              mx5
+efikamx                      arm         armv7       efikamx             -              mx5		mx51evk:IMX_CONFIG=board/efikamx/imximage.cfg
 mx51evk                      arm         armv7       mx51evk             freescale      mx5		mx51evk:IMX_CONFIG=board/freescale/mx51evk/imximage.cfg
 mx53evk                      arm         armv7       mx53evk             freescale      mx5		mx53evk:IMX_CONFIG=board/freescale/mx53evk/imximage.cfg
 mx53loco                     arm         armv7       mx53loco            freescale      mx5		mx53loco:IMX_CONFIG=board/freescale/mx53loco/imximage.cfg