OMAP3: PM debug: fix build error when !CONFIG_DEBUG_FS

The PM debug code fails to build on when CONFIG_DEBUG_FS is not
enabled.

Build error log:
arch/arm/mach-omap2/built-in.o: In function `omap_sram_idle':
arch/arm/mach-omap2/pm34xx.c:449: undefined reference to `pm_dbg_regset_save'
arch/arm/mach-omap2/pm34xx.c:460: undefined reference to `pm_dbg_regset_save'
arch/arm/mach-omap2/built-in.o: In function `configure_vc':
arch/arm/mach-omap2/pm34xx.c:1237: undefined reference to `pm_dbg_regset_init'
arch/arm/mach-omap2/pm34xx.c:1238: undefined reference to `pm_dbg_regset_init'
make: *** [.tmp_vmlinux1] Error 1

This patch fixes the above errors.

Kernel booting is tested on omap zoom2 and zoom3 boards.
Signed-off-by: NManjunatha GK <manjugk@ti.com>
Signed-off-by: NKevin Hilman <khilman@deeprootsystems.com>

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

@@ -604,6 +604,4 @@ static int __init pm_dbg_init(void)
 }
 arch_initcall(pm_dbg_init);
 
-#else
-void pm_dbg_update_time(struct powerdomain *pwrdm, int prev) {}
 #endif

arch/arm/mach-omap2/pm.h

@@ -32,12 +32,16 @@ extern struct omap_dm_timer *gptimer_wakeup;
 #ifdef CONFIG_PM_DEBUG
 extern void omap2_pm_dump(int mode, int resume, unsigned int us);
 extern int omap2_pm_debug;
+#else
+#define omap2_pm_dump(mode, resume, us)		do {} while (0);
+#define omap2_pm_debug				0
+#endif
+
+#if defined(CONFIG_PM_DEBUG) && defined(CONFIG_DEBUG_FS)
 extern void pm_dbg_update_time(struct powerdomain *pwrdm, int prev);
 extern int pm_dbg_regset_save(int reg_set);
 extern int pm_dbg_regset_init(int reg_set);
 #else
-#define omap2_pm_dump(mode, resume, us)		do {} while (0);
-#define omap2_pm_debug				0
 #define pm_dbg_update_time(pwrdm, prev) do {} while (0);
 #define pm_dbg_regset_save(reg_set) do {} while (0);
 #define pm_dbg_regset_init(reg_set) do {} while (0);