MAINTAINERS: Add mailing list for the TEE subsystem

Add a mailing list for patch reviews and discussions related to TEE
subsystem.
Suggested-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

MAINTAINERS

@@ -11670,11 +11670,13 @@ F:	drivers/scsi/st.h
 
 OP-TEE DRIVER
 M:	Jens Wiklander <jens.wiklander@linaro.org>
+L:	tee-dev@lists.linaro.org
 S:	Maintained
 F:	drivers/tee/optee/
 
 OP-TEE RANDOM NUMBER GENERATOR (RNG) DRIVER
 M:	Sumit Garg <sumit.garg@linaro.org>
+L:	tee-dev@lists.linaro.org
 S:	Maintained
 F:	drivers/char/hw_random/optee-rng.c
 
@@ -15439,6 +15441,7 @@ F:	include/media/i2c/tw9910.h
 
 TEE SUBSYSTEM
 M:	Jens Wiklander <jens.wiklander@linaro.org>
+L:	tee-dev@lists.linaro.org
 S:	Maintained
 F:	include/linux/tee_drv.h
 F:	include/uapi/linux/tee.h