MAINTAINERS: add entries for tee-related orphaned files

Add orphaned TEE/OP-TEE-related files to TEE subsystem entry in
MAINTAINERS. This includes:
- optee_rpmb cmd and test for it
- Misc. OP-TEE tests
- OP-TEE SCMI agent implementation
- Documentation, including device tree bindings

Signed-off-by: Igor Opaniuk <igor.opaniuk@gmail.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index d0a4a28..921ce05 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1640,9 +1640,18 @@
 M:	Ilias Apalodimas <ilias.apalodimas@linaro.org>
 T:	git https://source.denx.de/u-boot/custodians/u-boot-tpm.git
 S:	Maintained
+F:	cmd/optee*
+F:	doc/README.tee
+F:	doc/device-tree-bindings/firmware/linaro,optee-tz.txt
+F:	drivers/firmware/scmi/optee_agent.c
 F:	drivers/tee/
+F:	include/sandboxtee.h
 F:	include/tee.h
 F:	include/tee/
+F:	include/test/optee.h
+F:	test/dm/tee.c
+F:	test/optee/
+F:	test/py/tests/test_optee_rpmb.py
 
 TEE-lib
 M:	Bryan O'Donoghue <bryan.odonoghue@linaro.org>