powerpc: cpm2 boards: update fcc register logic

In the recent dropping of !NET_MULTI code (commit e2a53458a7ab37523304),
I misread the logic in include/net.h.  Some of it was used by NET_MULTI
code as glue between the multi/non-multi worlds for cpm2 boards.

Rather than restore the block of code, push the logic to the board config
headers where it all belongs.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/include/configs/sbc8560.h b/include/configs/sbc8560.h
index d219925..f928622 100644
--- a/include/configs/sbc8560.h
+++ b/include/configs/sbc8560.h
@@ -260,8 +260,8 @@
      * - Select bus for bd/buffers
      * - Full duplex
      */
-    #define CONFIG_SYS_CMXFCR_MASK	(CMXFCR_FC2 | CMXFCR_RF2CS_MSK | CMXFCR_TF2CS_MSK)
-    #define CONFIG_SYS_CMXFCR_VALUE	(CMXFCR_RF2CS_CLK13 | CMXFCR_TF2CS_CLK14)
+    #define CONFIG_SYS_CMXFCR_MASK2	(CMXFCR_FC2 | CMXFCR_RF2CS_MSK | CMXFCR_TF2CS_MSK)
+    #define CONFIG_SYS_CMXFCR_VALUE2	(CMXFCR_RF2CS_CLK13 | CMXFCR_TF2CS_CLK14)
     #define CONFIG_SYS_CPMFCR_RAMTYPE	0
     #define CONFIG_SYS_FCC_PSMR	(FCC_PSMR_FDE)