mvebu: fix missing includes in pmsu.c

The file is missing definitions for some functions due to not
including two header files. Fix the following warnings by
including "pmsu.h" and <linux/mvebu-pmsu.h> in pmsu.c:

arch/arm/mach-mvebu/pmsu.c:127:5: warning: symbol 'mvebu_setup_boot_addr_wa' was not declared. Should it be static?
arch/arm/mach-mvebu/pmsu.c:267:5: warning: symbol 'armada_370_xp_pmsu_idle_enter' was not declared. Should it be static?
arch/arm/mach-mvebu/pmsu.c:313:5: warning: symbol 'armada_38x_do_cpu_suspend' was not declared. Should it be static?
arch/arm/mach-mvebu/pmsu.c:340:6: warning: symbol 'mvebu_v7_pmsu_idle_exit' was not declared. Should it be static?
arch/arm/mach-mvebu/pmsu.c:570:5: warning: symbol 'mvebu_pmsu_dfs_request' was not declared. Should it be static?

Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

arch/arm/mach-mvebu/pmsu.c

@@ -25,6 +25,7 @@
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/mbus.h>
+#include <linux/mvebu-pmsu.h>
 #include <linux/of_address.h>
 #include <linux/of_device.h>
 #include <linux/platform_device.h>
@@ -38,7 +39,7 @@
 #include <asm/suspend.h>
 #include <asm/tlbflush.h>
 #include "common.h"
-
+#include "pmsu.h"
 
 #define PMSU_BASE_OFFSET    0x100
 #define PMSU_REG_SIZE	    0x1000