powerpc: fix i8042 module build error

of_i8042_{kbd,aux}_irq needs to be exported

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
index 15ade0d..9d4882a 100644
--- a/arch/powerpc/kernel/setup-common.c
+++ b/arch/powerpc/kernel/setup-common.c
@@ -96,7 +96,9 @@
 
 /* Variables required to store legacy IO irq routing */
 int of_i8042_kbd_irq;
+EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
 int of_i8042_aux_irq;
+EXPORT_SYMBOL_GPL(of_i8042_aux_irq);
 
 #ifdef __DO_IRQ_CANON
 /* XXX should go elsewhere eventually */