MAINTAINERS: ti-soc-thermal: add a co-maintainer and update the entry

Add myself as a co-maintainer for ti-soc-thermal

Signed-off-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

MAINTAINERS

@@ -11046,6 +11046,7 @@ F:	drivers/platform/x86/thinkpad_acpi.c
 
 TI BANDGAP AND THERMAL DRIVER
 M:	Eduardo Valentin <edubezval@gmail.com>
+M:	Keerthy <j-keerthy@ti.com>
 L:	linux-pm@vger.kernel.org
 L:	linux-omap@vger.kernel.org
 S:	Maintained