MAINTAINERS: Add maintainer for TI security related files

Changes involving High-Security boards should be CC'd for additional
assessment of the security implications.

Signed-off-by: Andrew F. Davis <afd@ti.com>

MAINTAINERS

@@ -434,6 +434,17 @@ S:	Maintained
 F:	drivers/spmi/
 F:	include/spmi/
 
+TI SYSTEM SECURITY
+M:	Andrew F. Davis <afd@ti.com>
+S:	Supported
+F:	arch/arm/mach-omap2/omap5/sec_entry_cpu1.S
+F:	arch/arm/mach-omap2/omap5/sec-fxns.c
+F:	arch/arm/mach-omap2/sec-common.c
+F:	arch/arm/mach-omap2/config_secure.mk
+F:	configs/am43xx_hs_evm_defconfig
+F:	configs/am57xx_hs_evm_defconfig
+F:	configs/dra7xx_hs_evm_defconfig
+
 TQ GROUP
 #M:	Martin Krause <martin.krause@tq-systems.de>
 S:	Orphaned (Since 2016-02)