gen: update due to sdbusplus-gen-meson change

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I9491eb608d9c6849b3e39fe212054a3651bfb824
diff --git a/gen/xyz/openbmc_project/State/Decorator/meson.build b/gen/xyz/openbmc_project/State/Decorator/meson.build
index e099718..10603d7 100644
--- a/gen/xyz/openbmc_project/State/Decorator/meson.build
+++ b/gen/xyz/openbmc_project/State/Decorator/meson.build
@@ -4,6 +4,7 @@
     'xyz/openbmc_project/State/Decorator/Availability__markdown'.underscorify(),
     input: [ '../../../../../yaml/xyz/openbmc_project/State/Decorator/Availability.interface.yaml',  ],
     output: [ 'Availability.md' ],
+    depend_files: sdbusplusplus_depfiles,
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
@@ -18,6 +19,7 @@
     'xyz/openbmc_project/State/Decorator/OperationalStatus__markdown'.underscorify(),
     input: [ '../../../../../yaml/xyz/openbmc_project/State/Decorator/OperationalStatus.interface.yaml',  ],
     output: [ 'OperationalStatus.md' ],
+    depend_files: sdbusplusplus_depfiles,
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
@@ -32,6 +34,7 @@
     'xyz/openbmc_project/State/Decorator/PowerState__markdown'.underscorify(),
     input: [ '../../../../../yaml/xyz/openbmc_project/State/Decorator/PowerState.interface.yaml',  ],
     output: [ 'PowerState.md' ],
+    depend_files: sdbusplusplus_depfiles,
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
@@ -46,6 +49,7 @@
     'xyz/openbmc_project/State/Decorator/PowerSystemInputs__markdown'.underscorify(),
     input: [ '../../../../../yaml/xyz/openbmc_project/State/Decorator/PowerSystemInputs.interface.yaml',  ],
     output: [ 'PowerSystemInputs.md' ],
+    depend_files: sdbusplusplus_depfiles,
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),