MAINTAINERS: TI SYSTEM SECURITY: remove invalid file

Remove a link to a non-existent file.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Acked-by: Andrew F. Davis <afd@ti.com>

MAINTAINERS

@@ -470,7 +470,6 @@ 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/am335x_hs_evm_defconfig