[POWERPC] Correct apparently misspelled "XMON" preprocessor symbol.

Correct the apparent misspelling of "XMON" to "CONFIG_XMON".
Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/platforms/chrp/setup.c

@@ -427,7 +427,7 @@ static void __init chrp_find_openpic(void)
 	of_node_put(np);
 }
 
-#if defined(CONFIG_VT) && defined(CONFIG_INPUT_ADBHID) && defined(XMON)
+#if defined(CONFIG_VT) && defined(CONFIG_INPUT_ADBHID) && defined(CONFIG_XMON)
 static struct irqaction xmon_irqaction = {
 	.handler = xmon_irq,
 	.mask = CPU_MASK_NONE,
@@ -493,7 +493,7 @@ static void __init chrp_find_8259(void)
 
 void __init chrp_init_IRQ(void)
 {
-#if defined(CONFIG_VT) && defined(CONFIG_INPUT_ADBHID) && defined(XMON)
+#if defined(CONFIG_VT) && defined(CONFIG_INPUT_ADBHID) && defined(CONFIG_XMON)
 	struct device_node *kbd;
 #endif
 	chrp_find_openpic();
@@ -510,7 +510,7 @@ void __init chrp_init_IRQ(void)
 	if (_chrp_type == _CHRP_Pegasos)
 		ppc_md.get_irq        = i8259_irq;
 
-#if defined(CONFIG_VT) && defined(CONFIG_INPUT_ADBHID) && defined(XMON)
+#if defined(CONFIG_VT) && defined(CONFIG_INPUT_ADBHID) && defined(CONFIG_XMON)
 	/* see if there is a keyboard in the device tree
 	   with a parent of type "adb" */
 	for (kbd = find_devices("keyboard"); kbd; kbd = kbd->next)