phosphor-fan.inc: bump version

Change-Id: I9af2a7936cd98cfbd89ae328011478425f5846a7
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/common/recipes-phosphor/fans/phosphor-fan.inc b/common/recipes-phosphor/fans/phosphor-fan.inc
index 19d4e28..6a821fa 100644
--- a/common/recipes-phosphor/fans/phosphor-fan.inc
+++ b/common/recipes-phosphor/fans/phosphor-fan.inc
@@ -2,4 +2,4 @@
 LICENSE = "Apache-2.0"
 LIC_FILES_CHKSUM = "file://${S}/LICENSE;md5=e3fc50a88d0a364313df4b21ef20c29e"
 SRC_URI += "git://github.com/openbmc/phosphor-fan-presence"
-SRCREV = "4c04a016faa989bbc1ad4334b164535f017954b1"
+SRCREV = "6fa181c781e59961e61f9cf5755ed220c2428c16"