configurations: sbp1: Read RTC battery voltage in 15min interval

Reduce the RTC battery voltage poll interval to 15min.

Change-Id: I65cd5bcf23b78b9add205fc9b4b94250d6377747
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
diff --git a/configurations/sbp1_baseboard.json b/configurations/sbp1_baseboard.json
index fb0584d..181c68f 100644
--- a/configurations/sbp1_baseboard.json
+++ b/configurations/sbp1_baseboard.json
@@ -354,7 +354,7 @@
             "MaxValue": 3.57,
             "MinValue": 0,
             "Name": "VBAT_RTC",
-            "PollRate": 86400,
+            "PollRate": 900,
             "ScaleFactor": 1.0,
             "Thresholds": [
                 {