regulators: Create regulators ComparePresenceAction class

Create the ComparePresenceAction class that implements the
"compare_presence" action in the JSON config file.

Only create the .hpp file for ComparePresenceAction class first.

Signed-off-by: Bob King <Bob_King@wistron.com>
Change-Id: If2cbe5e363ae92618604887f5c534dfa10ab216f
diff --git a/phosphor-regulators/test/meson.build b/phosphor-regulators/test/meson.build
index 242c02a..9102622 100644
--- a/phosphor-regulators/test/meson.build
+++ b/phosphor-regulators/test/meson.build
@@ -25,6 +25,7 @@
     'actions/action_error_tests.cpp',
     'actions/action_utils_tests.cpp',
     'actions/and_action_tests.cpp',
+    'actions/compare_presence_action_tests.cpp',
     'actions/i2c_action_tests.cpp',
     'actions/i2c_compare_bit_action_tests.cpp',
     'actions/i2c_compare_byte_action_tests.cpp',