Makefile: drop imx31_phycore from general Makefile

Signed-off-by: Stefano Babic <sbabic@denx.de>
diff --git a/boards.cfg b/boards.cfg
index 3254702..a3b4c56 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -39,6 +39,8 @@
 qong                         arm         arm1136     -                   davedenx       mx31
 mx31ads                      arm         arm1136     -                   freescale      mx31
 imx31_litekit                arm         arm1136     -                   logicpd        mx31
+imx31_phycore                arm         arm1136     -                   -              mx31
+imx31_phycore_eet            arm         arm1136     imx31_phycore       -              mx31         imx31_phycore:IMX31_PHYCORE_EET
 mx35pdk                      arm         arm1136     -                   freescale      mx35
 omap2420h4                   arm         arm1136     -                   ti             omap24xx
 tnetv107x_evm                arm         arm1176     tnetv107xevm        ti             tnetv107x