tests/: Add CMocka unit-test infrastructure

This adds the CMocka unit-testing infrastructure into
the meson build system which we will latter follow up
with unit-tests for flashrom's core logic.

BUG=b:157280555
BRANCH=none
TEST=builds

Change-Id: I66665f56627b3d99049176bfbebbd771b080370a
Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/41622
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

meson.build

@@ -424,3 +424,23 @@ executable(
 )
 
 subdir('util')
+
+# unit-test framework
+cmocka_dep = dependency(
+  'cmocka',
+  fallback: ['cmocka', 'cmocka_dep']
+)
+flashrom_test_dep = declare_dependency(
+  include_directories : include_directories('.'),
+  sources : [
+    srcs,
+    'cli_common.c',
+    'cli_output.c',
+    'flashrom.c',
+  ],
+  dependencies : [
+    deps,
+  ],
+)
+
+subdir('tests')