android_vibrator: warmup delay for vibration sensitivity

add warmup delay before vibrator off

Change-Id: Ie6dd325cc6c6b0f6d4501414442472cd40beb4df
Signed-off-by: Iliyan Malchev <malchev@google.com>
diff --git a/include/linux/android_vibrator.h b/include/linux/android_vibrator.h
index acaae1b..3d7d8c1 100644
--- a/include/linux/android_vibrator.h
+++ b/include/linux/android_vibrator.h
@@ -19,6 +19,7 @@
 	int enable_status;
 	int amp;
 	int vibe_n_value;
+	int vibe_warmup_delay; /* in ms */
 	int (*power_set)(int enable); /* LDO Power Set Function */
 	int (*pwm_set)(int enable, int gain, int n_value); /* PWM Set Function */
 	int (*ic_enable_set)(int enable); /* Motor IC Set Function */