[media] exynos4-is: Compile in fimc runtime PM callbacks conditionally

Enclose the runtime PM helpers in #ifdef CONFIG_PM_RUNTIME/#endif
to avoid following compile warning when CONFIG_PM_RUNTIME is disabled:

 CC      drivers/media/platform/exynos4-is/fimc-core.o
drivers/media/platform/exynos4-is/fimc-core.c:1040:12: warning: ‘fimc_runtime_resume’ defined but not used
drivers/media/platform/exynos4-is/fimc-core.c:1057:12: warning: ‘fimc_runtime_suspend’ defined but not used

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Reviewed-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/platform/exynos4-is/fimc-core.c

@@ -1037,6 +1037,7 @@ err_sclk:
 	return ret;
 }
 
+#ifdef CONFIG_PM_RUNTIME
 static int fimc_runtime_resume(struct device *dev)
 {
 	struct fimc_dev *fimc =	dev_get_drvdata(dev);
@@ -1069,6 +1070,7 @@ static int fimc_runtime_suspend(struct device *dev)
 	dbg("fimc%d: state: 0x%lx", fimc->id, fimc->state);
 	return ret;
 }
+#endif
 
 #ifdef CONFIG_PM_SLEEP
 static int fimc_resume(struct device *dev)