[POWERPC] Fix misspelled "CONFIG_CHECK_CACHE_COHERENCY" Kconfig option.

Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/platforms/embedded6xx/Kconfig b/arch/powerpc/platforms/embedded6xx/Kconfig
index bec7726..2d12f77 100644
--- a/arch/powerpc/platforms/embedded6xx/Kconfig
+++ b/arch/powerpc/platforms/embedded6xx/Kconfig
@@ -59,7 +59,7 @@
 config MV64X60
 	bool
 	select PPC_INDIRECT_PCI
-	select CONFIG_CHECK_CACHE_COHERENCY
+	select CHECK_CACHE_COHERENCY
 
 config MPC10X_OPENPIC
 	bool