MAINTAINERS: Add entry for TPM drivers

TPM drivers have currently no maintainers.  Add myself since I contributed
the TIS implementation.

Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index 00ff572..6db5354 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1187,6 +1187,11 @@
 F:	configs/j721e_hs_evm_r5_defconfig
 F:	configs/j721e_hs_evm_a72_defconfig
 
+TPM DRIVERS
+M:	Ilias Apalodimas <ilias.apalodimas@linaro.org>
+S:	Maintained
+F:	drivers/tpm/
+
 TQ GROUP
 #M:	Martin Krause <martin.krause@tq-systems.de>
 S:	Orphaned (Since 2016-02)