[POWERPC] CPM2: Make support for the CPM2 optional on 8560 based boards

Currently there is no way to disable the CPM2 support.  Some boards,
like the SBC8560 have their own external UART and don't have any direct
dependencies on the CPM for a serial console or anything else.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig
index 4286664..582a3a6 100644
--- a/arch/powerpc/platforms/Kconfig
+++ b/arch/powerpc/platforms/Kconfig
@@ -278,8 +278,8 @@
 	  for a machine with a QE coprocessor.
 
 config CPM2
-	bool
-	default n
+	bool "Enable support for the CPM2 (Communications Processor Module)"
+	depends on MPC85xx || 8260
 	select CPM
 	select PPC_LIB_RHEAP
 	help