powerpc/boot: Only build CPM code when necessary

As far as I can tell CONFIG_CPM is the right symbol to use to
conditionally compile the cpm-serial.c code.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index 650be83..ef6549e 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -108,7 +108,7 @@
 		$(libfdt) libfdt-wrapper.c \
 		ns16550.c serial.c simple_alloc.c div64.S util.S \
 		elf_util.c $(zlib-y) devtree.c stdlib.c \
-		oflib.c ofconsole.c cuboot.c cpm-serial.c
+		oflib.c ofconsole.c cuboot.c
 
 src-wlib-$(CONFIG_PPC_MPC52XX) += mpc52xx-psc.c
 src-wlib-$(CONFIG_PPC64_BOOT_WRAPPER) += opal-calls.S opal.c
@@ -121,6 +121,7 @@
 src-wlib-$(CONFIG_PPC_82xx) += pq2.c fsl-soc.c planetcore.c
 src-wlib-$(CONFIG_EMBEDDED6xx) += mpsc.c mv64x60.c mv64x60_i2c.c ugecon.c fsl-soc.c
 src-wlib-$(CONFIG_XILINX_VIRTEX) += uartlite.c
+src-wlib-$(CONFIG_CPM) += cpm-serial.c
 
 src-plat-y := of.c epapr.c
 src-plat-$(CONFIG_40x) += fixed-head.S ep405.c cuboot-hotfoot.c \