fans: Unpin from temporary commit

Use the latest bumped upstream commit of the phosphor-fan-presence repo.

Change-Id: Ib0c1ef2b5f748a95c3bad23f2a8e9815a16b74b4
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
diff --git a/recipes-phosphor/fans/phosphor-fan_%.bbappend b/recipes-phosphor/fans/phosphor-fan_%.bbappend
index 834768c..9f9868f 100644
--- a/recipes-phosphor/fans/phosphor-fan_%.bbappend
+++ b/recipes-phosphor/fans/phosphor-fan_%.bbappend
@@ -1,5 +1,3 @@
-SRCREV = "8e1b382122fed73e788d44f3a67cecbfbcc6972e"
-
 FILESEXTRAPATHS_prepend := "${THISDIR}/${BPN}:"
 
 # Package configuration