thermal: Add support for TI LM74

LM74 is a SPI temperature sensor.

Implement a driver to read temperature from it.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index 681b621..440eb64 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -41,4 +41,10 @@
 	 Enable thermal support for for the Texas Instruments DRA752 SoC family.
 	 The driver supports reading CPU temperature.
 
+config TI_LM74_THERMAL
+        bool "Temperature sensor driver for TI LM74 chip"
+        help
+	 Enable thermal support for the Texas Instruments LM74 chip.
+	 The driver supports reading CPU temperature.
+
 endif # if DM_THERMAL