Add TMP421 to Palmetto config
diff --git a/meta-palmetto/recipes-kernel/linux/linux-obmc/palmetto.cfg b/meta-palmetto/recipes-kernel/linux/linux-obmc/palmetto.cfg
new file mode 100644
index 0000000..2594dec
--- /dev/null
+++ b/meta-palmetto/recipes-kernel/linux/linux-obmc/palmetto.cfg
@@ -0,0 +1,4 @@
+CONFIG_HWMON=y
+CONFIG_SENSORS_NCT7904=y
+CONFIG_EEPROM_AT24=y
+CONFIG_SENSORS_TMP421=y