phosphor-power: srcrev bump b3853e2d3a..7dc31bb1f7

Add nlohmann-json dependency to fix build failure.

George Liu (1):
      Add an example JSON file based on power-supply

Lei YU (1):
      Add loadJSONFromFile() in utility

Change-Id: I617373558d1c24f9fcb4b10286c2bdb8c6a7e1d2
Signed-off-by: Andrew Geissler <openbmcbump-github@yahoo.com>
diff --git a/meta-witherspoon/recipes-phosphor/power/witherspoon-pfault-analysis.inc b/meta-witherspoon/recipes-phosphor/power/witherspoon-pfault-analysis.inc
index 0612d62..668d837 100644
--- a/meta-witherspoon/recipes-phosphor/power/witherspoon-pfault-analysis.inc
+++ b/meta-witherspoon/recipes-phosphor/power/witherspoon-pfault-analysis.inc
@@ -2,4 +2,4 @@
 LICENSE = "Apache-2.0"
 LIC_FILES_CHKSUM = "file://${S}/LICENSE;md5=e3fc50a88d0a364313df4b21ef20c29e"
 SRC_URI += "git://github.com/openbmc/phosphor-power"
-SRCREV = "b3853e2d3ac295a961e08927d177b40ddd683914"
+SRCREV = "7dc31bb1f711927e80b900e256f8d413b2e71331"