lm-sensors: update names of lm-sensos conf file

Since lm-sensors supports both /etc/sensors.conf and /etc/sensors3.conf
as valid default configuration files, we should propagate one of both
across a sysupgrade if we encounter them.

Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>

utils/lm-sensors/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=lm-sensors
 PKG_VERSION:=3.3.5
-PKG_RELEASE:=3
+PKG_RELEASE:=4
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL:=https://github.com/groeck/lm-sensors.git
@@ -66,6 +66,7 @@ endef
 
 define Package/lm-sensors/conffiles
 /etc/sensors.conf
+/etc/sensors3.conf
 endef
 
 define Build/Compile