iio: accel: kxcjk-1013: Fix defined but unused warning

Noticed when compiling with CONFIG_PM_RUNTIME not set:
kxcjk-1013.c: warning: ‘kxcjk1013_get_startup_times’ defined but not used [-Wunused-function]

Introduced by commit 124e1b1 (iio: accel: kxcjk-1013: support runtime pm).

Signed-off-by: Daniel Baluta <daniel.baluta@intel.com>
Reviewed-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/accel/kxcjk-1013.c

@@ -358,6 +358,7 @@ static int kxcjk1013_chip_init(struct kxcjk1013_data *data)
 	return 0;
 }
 
+#ifdef CONFIG_PM_RUNTIME
 static int kxcjk1013_get_startup_times(struct kxcjk1013_data *data)
 {
 	int i;
@@ -370,6 +371,7 @@ static int kxcjk1013_get_startup_times(struct kxcjk1013_data *data)
 
 	return KXCJK1013_MAX_STARTUP_TIME_US;
 }
+#endif
 
 static int kxcjk1013_set_power_state(struct kxcjk1013_data *data, bool on)
 {