configs: j721e: Merge the HS and non-HS defconfigs

K3 devices have runtime type board detection. Make the default defconfig
include the secure configuration. Then remove the HS specific config.

Non-HS devices will continue to boot due to runtime device type detection.
If TI_SECURE_DEV_PKG is not set the build will emit warnings, for non-HS
devices these can be ignored.

Reviewed-by: Bryan Brattlof <bb@ti.com>
Reviewed-by: Neha Malcom Francis <n-francis@ti.com>
Acked-by: Andrew Davis <afd@ti.com>
Signed-off-by: Manorit Chawdhry <m-chawdhry@ti.com>
diff --git a/configs/j721e_evm_r5_defconfig b/configs/j721e_evm_r5_defconfig
index 16fa386..4760726 100644
--- a/configs/j721e_evm_r5_defconfig
+++ b/configs/j721e_evm_r5_defconfig
@@ -1,5 +1,6 @@
 CONFIG_ARM=y
 CONFIG_ARCH_K3=y
+CONFIG_TI_SECURE_DEVICE=y
 CONFIG_SYS_MALLOC_LEN=0x2000000
 CONFIG_SYS_MALLOC_F_LEN=0x70000
 CONFIG_SPL_GPIO=y