meta-hxt: add some sensors support for rep2

HXT stardragon4800 is an ARMv8-compatible 48-core processor chip.
The REP2 is a reference design board for stardragon4800.
BMC will handle the sensors,devices by I2C,SPI, include:
IR38163, PXM1310, NVT210, TMP421, ADM1278, PCA9641 and so on.

Change-Id: I1dca7e050a57fdc440448f01202a196fb8b0dc61
Signed-off-by: Yuan Yao <yao.yuan@hxt-semitech.com>
diff --git a/meta-stardragon4800-rep2/recipes-phosphor/sensors/phosphor-hwmon/obmc/hwmon/ahb/apb/i2c@1e78a000/i2c-bus@1c0/tmp421@4f.conf b/meta-stardragon4800-rep2/recipes-phosphor/sensors/phosphor-hwmon/obmc/hwmon/ahb/apb/i2c@1e78a000/i2c-bus@1c0/tmp421@4f.conf
new file mode 100644
index 0000000..ee3b5d5
--- /dev/null
+++ b/meta-stardragon4800-rep2/recipes-phosphor/sensors/phosphor-hwmon/obmc/hwmon/ahb/apb/i2c@1e78a000/i2c-bus@1c0/tmp421@4f.conf
@@ -0,0 +1,3 @@
+LABEL_temp1=SYS_INLET_3
+CRITLO_temp1=0
+CRITHI_temp1=50000