[PATCH] ia64: move HCDP under serial console #ifdef

Currently you can select HCDP independent of serial console.  This
doesn't seem very useful, and makes the setup_serial_hcdp() reference
unresolved if the serial driver is built as a module.

CONFIG_SERIAL_8250_CONSOLE is only selectable if the serial core is
built in (SERIAL_8250=y), so this patch makes sure we don't try to
call setup_serial_hcdp() unless it is actually built in to the kernel.

(I think we should also make HCDP selection dependent on
SERIAL_8250_CONSOLE=y in Kconfig; I'll send a separate patch
for that since it's not ia64-specific.)

arch/ia64/kernel/setup.c

@@ -322,13 +322,13 @@ setup_arch (char **cmdline_p)
 #ifdef CONFIG_ACPI_BOOT
 	acpi_boot_init();
 #endif
+#ifdef CONFIG_SERIAL_8250_CONSOLE
 #ifdef CONFIG_SERIAL_8250_HCDP
 	if (efi.hcdp) {
 		void setup_serial_hcdp(void *);
 		setup_serial_hcdp(efi.hcdp);
 	}
 #endif
-#ifdef CONFIG_SERIAL_8250_CONSOLE
 	/*
 	 * Without HCDP, we won't discover any serial ports until the serial driver looks
 	 * in the ACPI namespace.  If ACPI claims there are some legacy devices, register