MAINTAINERS: Add Hal as one of the maintainers of SFCTEMP HWMON DRIVER

As he is the submitter of this driver, add his mail so he can
maintain the driver and easily reply in the mailing list.
Acked-by: Emil Renner Berthing <kernel@esmil.dk>
Signed-off-by: Hal Feng <hal.feng@starfivetech.com>
Link: https://lore.kernel.org/r/20230928075249.109459-1-hal.feng@starfivetech.comSigned-off-by: Guenter Roeck <linux@roeck-us.net>

MAINTAINERS

@@ -19409,6 +19409,7 @@ F:	drivers/net/ethernet/sfc/
 
 SFCTEMP HWMON DRIVER
 M:	Emil Renner Berthing <kernel@esmil.dk>
+M:	Hal Feng <hal.feng@starfivetech.com>
 L:	linux-hwmon@vger.kernel.org
 S:	Maintained
 F:	Documentation/devicetree/bindings/hwmon/starfive,jh71x0-temp.yaml