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/ppmc8260.h b/include/configs/ppmc8260.h
index 68c6277..327863e 100644
--- a/include/configs/ppmc8260.h
+++ b/include/configs/ppmc8260.h
@@ -372,8 +372,8 @@
  * - Select bus for bd/buffers (see 28-13)
  * - Enable Full Duplex in FSMR
  */
-#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 | FCC_PSMR_LPB)
 #endif	/* CONFIG_ETHER_INDEX */