regulators: Add pmbus_write_vout_command action

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

Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>
Change-Id: Idef8da56d19df8a416efec068ffa9fb9493100cc
diff --git a/phosphor-regulators/src/meson.build b/phosphor-regulators/src/meson.build
index 816e74c..b652f08 100644
--- a/phosphor-regulators/src/meson.build
+++ b/phosphor-regulators/src/meson.build
@@ -13,7 +13,8 @@
     'actions/i2c_compare_bytes_action.cpp',
     'actions/i2c_write_bit_action.cpp',
     'actions/i2c_write_byte_action.cpp',
-    'actions/i2c_write_bytes_action.cpp'
+    'actions/i2c_write_bytes_action.cpp',
+    'actions/pmbus_write_vout_command_action.cpp'
 ]
 
 phosphor_regulators_library = static_library(