espi-control: Add program to disable eSPI

This commit introduces a program that can disable and re-enable eSPI on
a Nuvoton BMC.

Tested:
- Ran "npcm7xx_espi_control -d", and confirmed that IPMI stopped
  working.
- Ran "npcm7xx_espi_control", and confirmed that IPMI started working
  again.

Change-Id: I9637ac4d84b82931f107946ff53e7ef16a965d25
Signed-off-by: John Wedig <johnwedig@google.com>
diff --git a/subprojects/espi-control/meson.build b/subprojects/espi-control/meson.build
new file mode 100644
index 0000000..9e45228
--- /dev/null
+++ b/subprojects/espi-control/meson.build
@@ -0,0 +1,23 @@
+project(
+  'espi_control',
+  'cpp',
+  version: '0.1',
+  meson_version: '>=1.1.1',
+  default_options: [
+    'warning_level=3',
+    'werror=true',
+    'cpp_std=c++23',
+  ],
+)
+
+executable(
+  'npcm7xx-espi-control',
+  'npcm7xx_espi_control.cpp',
+  implicit_include_directories: false,
+  dependencies:
+  [
+    dependency('stdplus'),
+  ],
+  install: true,
+  install_dir: get_option('libexecdir'),
+)