sensors:max31785: Remove `x` perms from udev rule file

Remove executable permissions from the `70-max31785-hwmon.rules` file to
eliminate the systemd-udevd warning that its marked executable.

Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
Change-Id: I4ac68a0b4f83d4d8a2e2f5273618bea74d2aba79
diff --git a/recipes-phosphor/sensors/phosphor-hwmon_%.bbappend b/recipes-phosphor/sensors/phosphor-hwmon_%.bbappend
index 4886ca7..6cba853 100644
--- a/recipes-phosphor/sensors/phosphor-hwmon_%.bbappend
+++ b/recipes-phosphor/sensors/phosphor-hwmon_%.bbappend
@@ -112,7 +112,7 @@
 
 do_install_append_ibm-ac-server() {
     install -d ${D}/${base_libdir}/udev/rules.d/
-    install ${WORKDIR}/70-max31785-hwmon.rules ${D}/${base_libdir}/udev/rules.d/
+    install -m 0644 ${WORKDIR}/70-max31785-hwmon.rules ${D}/${base_libdir}/udev/rules.d/
 
     install -d ${D}${bindir}
     install -m 0755 ${WORKDIR}/start_max31785_hwmon.sh ${D}${bindir}