uwb: enable low power

Bug: 187840615
Signed-off-by: Victor Liu <victorliu@google.com>
Change-Id: Ib790e9e129e2613362566b888569407e8a32a808
diff --git a/uwb/calibration/UWB-calibration.conf.raven b/uwb/calibration/UWB-calibration.conf.raven
index e344459..95216c1 100644
--- a/uwb/calibration/UWB-calibration.conf.raven
+++ b/uwb/calibration/UWB-calibration.conf.raven
@@ -108,7 +108,7 @@
 xtal_trim=31
 temperature_reference=85
 smart_tx_power=1
-auto_sleep_margin=-1
+auto_sleep_margin=20000
 [HAL]antenna_pair_azimuth=4
 [HAL]antenna_pair_elevation=4
 [HAL]tx_antenna=0