regulators: Implement i2c_compare_byte action

Implement the i2c_compare_byte action in the JSON config file.  See
i2c_compare_byte.md for more information about this action.

Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: I258027f969684022f6fd5d85ab4dc32b4746a69c
diff --git a/phosphor-regulators/test/meson.build b/phosphor-regulators/test/meson.build
index 2a41cd1..d5e3d5d 100644
--- a/phosphor-regulators/test/meson.build
+++ b/phosphor-regulators/test/meson.build
@@ -13,6 +13,8 @@
     'actions/action_error_tests.cpp',
     'actions/action_utils_tests.cpp',
     'actions/and_action_tests.cpp',
+    'actions/i2c_action_tests.cpp',
+    'actions/i2c_compare_byte_action_tests.cpp',
     'actions/if_action_tests.cpp',
     'actions/not_action_tests.cpp',
     'actions/or_action_tests.cpp',