[POWERPC] iSeries: allow CONFIG_CMDLINE

It doesn't hurt to have this enabled on legacy iSeries and will mean it
is available for a combined build.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index c04b713..836caf1 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -852,7 +852,6 @@
 
 config CMDLINE_BOOL
 	bool "Default bootloader kernel arguments"
-	depends on !PPC_ISERIES
 
 config CMDLINE
 	string "Initial kernel command string"