Add Palmetto hwmons

Add some hardcoded (not from MRW) labels and thresholds
for rtc and tmp423 sensor chips.

Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
Change-Id: I182b34665de8f2e32dd47336879367f415f57150
diff --git a/meta-palmetto/recipes-phosphor/sensors/phosphor-hwmon%/obmc/hwmon/ahb/apb/i2c@1e78a000/i2c-bus@40/rtc@68.conf b/meta-palmetto/recipes-phosphor/sensors/phosphor-hwmon%/obmc/hwmon/ahb/apb/i2c@1e78a000/i2c-bus@40/rtc@68.conf
new file mode 100644
index 0000000..8b6053e
--- /dev/null
+++ b/meta-palmetto/recipes-phosphor/sensors/phosphor-hwmon%/obmc/hwmon/ahb/apb/i2c@1e78a000/i2c-bus@40/rtc@68.conf
@@ -0,0 +1,3 @@
+LABEL_temp1=rtc
+WARNLO_temp1=10000
+WARNHI_temp1=35000