PM debug: Fix warning when no CONFIG_DEBUG_FS

Fix following warning when CONFIG_DEBUG_FS wasn't selected:

arch/arm/mach-omap2/pm-debug.c:57: warning: 'pm_dbg_init' declared 'static' but never defined
Signed-off-by: Sergio Aguirre <saaguirre@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>

arch/arm/mach-omap2/pm-debug.c

@@ -54,8 +54,6 @@ int omap2_pm_debug;
 	regs[reg_count++].val = \
 			 __raw_readl(OMAP2_L4_IO_ADDRESS(0x480fe000 + (off)))
 
-static int __init pm_dbg_init(void);
-
 void omap2_pm_dump(int mode, int resume, unsigned int us)
 {
 	struct reg {
@@ -167,6 +165,8 @@ struct dentry *pm_dbg_dir;
 
 static int pm_dbg_init_done;
 
+static int __init pm_dbg_init(void);
+
 enum {
 	DEBUG_FILE_COUNTERS = 0,
 	DEBUG_FILE_TIMERS,