meta-romulus: Pick latest phosphor-hwmon

This revision adds the FanPwm interface support which is used by Romulus
as well.

Change-Id: I44c7ba66028eb54630268019acc78a9e3720e621
Signed-off-by: Lei YU <mine260309@gmail.com>
diff --git a/meta-romulus/recipes-phosphor/sensors/phosphor-hwmon%.bbappend b/meta-romulus/recipes-phosphor/sensors/phosphor-hwmon%.bbappend
index 7969349..1572980 100644
--- a/meta-romulus/recipes-phosphor/sensors/phosphor-hwmon%.bbappend
+++ b/meta-romulus/recipes-phosphor/sensors/phosphor-hwmon%.bbappend
@@ -3,7 +3,7 @@
 # Pin the revision so the patch is guaranteed to be appliable
 # TODO: Remove this when the error handling in hwmon is done:
 # https://gerrit.openbmc-project.xyz/#/c/8073/
-SRCREV = "26d21731c292a02ec71480fade9a06658160eafb"
+SRCREV = "a7e2c1e5c1e94246ae55313fc361d30b0e1a6165"
 
 SRC_URI += " file://0001-sysfs-Return-ETIMEDOUT-instead-of-throw-exception.patch"