configs: Add configs for j721s2 High Security EVM

Add j721s2 High Security EVM defconfig.

These configs are same as for the non-secure part, except for:
        CONFIG_TI_SECURE_DEVICE option set to 'y'
        CONFIG_FIT_IMAGE_POST_PROCESS option set to 'y'
        CONFIG_SPL_FIT_IMAGE_POST_PROCESS option set to 'y'
        CONFIG_BOOTCOMMAND uses FIT images for booting

Signed-off-by: Jayesh Choudhary <j-choudhary@ti.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index d66e382..1a7a563 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1393,6 +1393,8 @@
 F:	configs/j7200_hs_evm_r5_defconfig
 F:	configs/j721e_hs_evm_a72_defconfig
 F:	configs/j721e_hs_evm_r5_defconfig
+F:	configs/j721s2_hs_evm_a72_defconfig
+F:	configs/j721s2_hs_evm_r5_defconfig
 
 TPM DRIVERS
 M:	Ilias Apalodimas <ilias.apalodimas@linaro.org>