build(api-demo): Integrate API into build

Signed-off-by: Rahix <rahix@rahix.de>

hw-tests/api-demo/meson.build

@@ -17,6 +17,7 @@ name = 'api-demo-core0'
 executable(
   name + '.elf',
   'main.c',
+  './api/api_caller.c',
   api_stubs[0],
   dependencies: [libcard10, max32665_startup_core0],
   link_whole: [max32665_startup_core0_lib, board_card10_lib],
@@ -30,6 +31,7 @@ name = 'api-demo-core1'
 executable(
   name + '.elf',
   'test-payload.c',
+  './api/api_dispatcher.c',
   api_stubs[1],
   dependencies: [libcard10, max32665_startup_core1],
   link_whole: [max32665_startup_core1_lib, board_card10_lib],