j721e: schema: yaml: Add general schema and J721E board config files

Schema file in YAML must be provided in board/ti/common for validating
input config files and packaging system firmware. The schema includes
entries for rm-cfg, board-cfg, pm-cfg and sec-cfg.

Board config files must be provided in board/ti/<devicename> in YAML.
These can then be consumed for generation of binaries to package system
firmware. Added YAML configs for J721E in particular.

Signed-off-by: Tarun Sahu <t-sahu@ti.com>
[n-francis@ti.com: prepared patch for upstreaming]
Signed-off-by: Neha Malcom Francis <n-francis@ti.com>
diff --git a/board/ti/j721e/board-cfg.yaml b/board/ti/j721e/board-cfg.yaml
new file mode 100644
index 0000000..1375dca
--- /dev/null
+++ b/board/ti/j721e/board-cfg.yaml
@@ -0,0 +1,36 @@
+# SPDX-License-Identifier: GPL-2.0+
+# Copyright (C) 2022-2023 Texas Instruments Incorporated - https://www.ti.com/
+#
+# Board configuration for J721E
+#
+
+---
+
+board-cfg:
+        rev:
+                boardcfg_abi_maj: 0x0
+                boardcfg_abi_min: 0x1
+        control:
+                subhdr:
+                        magic: 0xC1D3
+                        size: 7
+                main_isolation_enable: 0x5A
+                main_isolation_hostid: 0x2
+        secproxy:
+                subhdr:
+                        magic: 0x1207
+                        size: 7
+                scaling_factor: 0x1
+                scaling_profile: 0x1
+                disable_main_nav_secure_proxy: 0
+        msmc:
+                subhdr:
+                        magic: 0xA5C3
+                        size: 5
+                msmc_cache_size: 0x0
+        debug_cfg:
+                subhdr:
+                        magic: 0x020C
+                        size: 8
+                trace_dst_enables: 0x00
+                trace_src_enables: 0x00