clocksource: time-armada-370-xp: Fix sparse warning

drivers/clocksource/time-armada-370-xp.c:217:13: warning: symbol
'armada_370_xp_timer_init' was not declared. Should it be static?

Also remove the __init marking in the prototype as it's
unnecessary and drop the init.h file.
Acked-by: NGregory CLEMENT <gregory.clement@free-electrons.com>
Acked-by: NMarc Zyngier <marc.zyngier@arm.com>
Signed-off-by: NStephen Boyd <sboyd@codeaurora.org>

drivers/clocksource/time-armada-370-xp.c

@@ -28,9 +28,10 @@
 #include <linux/irq.h>
 #include <linux/module.h>
 #include <linux/sched_clock.h>
+#include <linux/percpu.h>
+#include <linux/time-armada-370-xp.h>
 
 #include <asm/localtimer.h>
-#include <linux/percpu.h>
 /*
  * Timer block registers.
  */

include/linux/time-armada-370-xp.h

@@ -11,8 +11,6 @@
 #ifndef __TIME_ARMADA_370_XPPRCMU_H
 #define __TIME_ARMADA_370_XPPRCMU_H
 
-#include <linux/init.h>
-
-void __init armada_370_xp_timer_init(void);
+void armada_370_xp_timer_init(void);
 
 #endif