meson: ipa, proxy: Generate headers and proxy with mojo

Run mojo from meson to generate the header, serializer, and proxy files
for every pipeline's mojom data definition file.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

utils/ipc/generators/meson.build

@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: CC0-1.0
+
+subdir('libcamera_templates')

utils/ipc/meson.build

@@ -1,3 +1,16 @@
 # SPDX-License-Identifier: CC0-1.0
 
+subdir('generators')
+
 py_modules += ['jinja2', 'ply']
+
+mojom_parser = find_program('./parser.py')
+
+mojom_generator = find_program('./generate.py')
+
+mojom_templates = custom_target('mojom_templates',
+                                input : mojom_template_files,
+                                output : 'libcamera_templates.zip',
+                                command : [mojom_generator, '-o', '@OUTDIR@', 'precompile'])
+
+mojom_templates_dir = meson.current_build_dir()