arm: mach-k3: Add secure device support

K3 devices have High Security (HS) variants along with the non-HS already
supported. Like the previous generation devices (OMAP/Keystone2) K3
supports boot chain-of-trust by authenticating and optionally decrypting
images as they are unpacked from FIT images. Add support for this here.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Andreas Dannenberg <dannenberg@ti.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 8a7f0cc..dab419e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -733,6 +733,7 @@
 F:	arch/arm/mach-omap2/omap5/sec_entry_cpu1.S
 F:	arch/arm/mach-omap2/sec-common.c
 F:	arch/arm/mach-omap2/config_secure.mk
+F:	arch/arm/mach-k3/security.c
 F:	configs/am335x_hs_evm_defconfig
 F:	configs/am335x_hs_evm_uart_defconfig
 F:	configs/am43xx_hs_evm_defconfig