i2c: Add binding for MCTP over I2C transport

Implements DSP0237. This has a fixed neighbor table (currently 4
entries), with neighbors learned on reception, or set with
mctp_i2c_set_neighbour().

Change-Id: I9b1e2c3673149cd0b9fee0d8113f3cac0e336bc7
Signed-off-by: Matt Johnston <matt@codeconstruct.com.au>
diff --git a/tests/meson.build b/tests/meson.build
index 4ca52a0..96d7d6b 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -13,6 +13,9 @@
 if get_option('bindings').contains('astlpc')
     tests += 'test_astlpc'
 endif
+if get_option('bindings').contains('i2c')
+    tests += 'test_i2c'
+endif
 
 test_include_dirs = [include_directories('.'), libmctp_include_dir]
 foreach t : tests