meta-ampere: fix compilation error with latest Yocto

Make the following changes to fix compilation errors:
1. Add honister to LAYERSERIES_COMPAT
2. Increase CONF_VERSION to 2.
3. Fix mistake on previous change on Yocto syntax update.

Tested:
1. Compile OpenBMC for Mt.Jade without error.

Signed-off-by: Thang Q. Nguyen <thang@os.amperecomputing.com>
Change-Id: I5ac3f568d776109955759fab78844b1d38a51af1
diff --git a/meta-ampere/meta-jade/recipes-phosphor/sensors/phosphor-hwmon_%.bbappend b/meta-ampere/meta-jade/recipes-phosphor/sensors/phosphor-hwmon_%.bbappend
index 11cdbe6..b938437 100644
--- a/meta-ampere/meta-jade/recipes-phosphor/sensors/phosphor-hwmon_%.bbappend
+++ b/meta-ampere/meta-jade/recipes-phosphor/sensors/phosphor-hwmon_%.bbappend
@@ -21,7 +21,7 @@
 ITEMS += "iio-hwmon.conf iio-hwmon-adc14.conf iio-hwmon-battery.conf"
 
 ENVS = "obmc/${MACHINE}/hwmon/{0}"
-SYSTEMD_ENVIRONMENT_FILE:${PN}:append:mtjade = " ${@compose_list(d, 'ENVS', 'ITEMS')}"
+SYSTEMD_ENVIRONMENT_FILE_${PN}:append:mtjade = " ${@compose_list(d, 'ENVS', 'ITEMS')}"
 
 do_install:append:mtjade() {
   SOURCEDIR="${WORKDIR}/obmc/${MACHINE}/hwmon"