spec/build/bsps: Add dtb support

Add dtb and dtb header path configurable build option

spec/build/bsps/optdtb.yml

@@ -0,0 +1,19 @@
+SPDX-License-Identifier: CC-BY-SA-4.0 OR BSD-2-Clause
+actions:
+- get-boolean: null
+- define-condition: null
+build-type: option
+copyrights:
+- Copyright (C) 2020 embedded brains GmbH (http://www.embedded-brains.de)
+default: false
+default-by-variant:
+- value: true
+  variants:
+  - riscv/mpfs64.*
+description: |
+  the path to the header file containing the device tree binary. See the BSP
+  documentation for more information.
+enabled-by: true
+links: []
+name: BSP_DTB_IS_SUPPORTED
+type: build

spec/build/bsps/optdtbheaderpath.yml

@@ -0,0 +1,20 @@
+SPDX-License-Identifier: CC-BY-SA-4.0 OR BSD-2-Clause
+actions:
+- get-string: null
+- define: null
+build-type: option
+copyrights:
+- Copyright (C) 2022 On-Line Applications Research Corporation (OAR)
+default: false
+default-by-variant:
+- value: bsp/mpfs-dtb.h
+  variants:
+  - riscv/mpfs64.*
+description: |
+  the path to the header file containing the device tree binary. See the BSP
+  documentation for more information.
+enabled-by: true
+format: '{}'
+links: []
+name: BSP_DTB_HEADER_PATH
+type: build