Relabel fan tach inventory items for clarity in the Web UI

meta-rcs/meta-blackbird/recipes-phosphor/fans/phosphor-fan/label-fan-tachs-in-inventory.patch

+diff --git a/monitor/tach_sensor.cpp b/monitor/tach_sensor.cpp
+index 5494450..6832ffe 100644
+--- a/monitor/tach_sensor.cpp
++++ b/monitor/tach_sensor.cpp
+@@ -81,7 +81,7 @@ TachSensor::TachSensor(Mode mode,
+     _bus(bus),
+     _fan(fan),
+     _name(FAN_SENSOR_PATH + id),
+-    _invName(path(fan.getName()) / id),
++    _invName(path(fan.getName()) / (id + "tach")),
+     _hasTarget(hasTarget),
+     _funcDelay(funcDelay),
+     _interface(interface),

meta-rcs/meta-blackbird/recipes-phosphor/fans/phosphor-fan_%.bbappend

@@ -5,6 +5,8 @@ FAN_PACKAGES += " \
         phosphor-cooling-type \
 "
 
+SRC_URI += "file://label-fan-tachs-in-inventory.patch"
+
 PACKAGECONFIG += "cooling-type"
 
 RDEPENDS_phosphor-cooling-type += "libevdev"