[PARISC] Build fixes for power.c

<linux/pm.h> is no longer implicitly included.
Signed-off-by: NKyle McMartin <kyle@parisc-linux.org>

drivers/parisc/power.c

@@ -41,6 +41,7 @@
 #include <linux/reboot.h>
 #include <linux/sched.h>
 #include <linux/kthread.h>
+#include <linux/pm.h>
 
 #include <asm/pdc.h>
 #include <asm/io.h>