[POWERPC] Fix apparent typo "CONFIG_SERIAL_CPM_SMC".

  Replace an apparent typo of CONFIG_SERIAL_CPM_SMC with
CONFIG_SERIAL_CPM_SMC2.
Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/ppc/platforms/mpc866ads_setup.c

@@ -369,7 +369,7 @@ int __init mpc866ads_init(void)
 	ppc_sys_device_setfunc(MPC8xx_CPM_SMC1, PPC_SYS_FUNC_UART);
 #endif
 
-#ifdef CONFIG_SERIAL_CPM_SMC
+#ifdef CONFIG_SERIAL_CPM_SMC2
 	ppc_sys_device_enable(MPC8xx_CPM_SMC2);
 	ppc_sys_device_setfunc(MPC8xx_CPM_SMC2, PPC_SYS_FUNC_UART);
 #endif