[posix] enhance config header file (#11426)

This commit enhances the `openthread-posix-config.h` header by:

- Moving configurations defined in other headers
  (`platform-posix.h`) into this common header.
- Making sure the section containing guard checks for removed or
  renamed POSIX configurations is at the end of the header file.

src/posix/platform/openthread-posix-config.h

@@ -256,6 +256,15 @@
 #define OPENTHREAD_POSIX_CONFIG_THREAD_NETIF_DEFAULT_NAME "wpan0"
 #endif
 
+/**
+ * @def OPENTHREAD_POSIX_VIRTUAL_TIME
+ *
+ * This setting configures whether to use virtual time.
+ */
+#ifndef OPENTHREAD_POSIX_VIRTUAL_TIME
+#define OPENTHREAD_POSIX_VIRTUAL_TIME 0
+#endif
+
 #ifdef __APPLE__
 
 /**
@@ -279,17 +288,6 @@
 
 #endif // __APPLE__
 
-//---------------------------------------------------------------------------------------------------------------------
-// Removed or renamed POSIX specific configs.
-
-#ifdef OPENTHREAD_CONFIG_POSIX_APP_TREL_INTERFACE_NAME
-#error "OPENTHREAD_CONFIG_POSIX_APP_TREL_INTERFACE_NAME was removed (no longer applicable with TREL over DNS-SD)."
-#endif
-
-#ifdef OPENTHREAD_CONFIG_POSIX_TREL_USE_NETLINK_SOCKET
-#error "OPENTHREAD_CONFIG_POSIX_TREL_USE_NETLINK_SOCKET was removed (no longer applicable with TREL over DNS-SD)."
-#endif
-
 /**
  * @def OPENTHREAD_POSIX_CONFIG_TREL_UDP_PORT
  *
@@ -444,4 +442,15 @@
 #define OPENTHREAD_POSIX_CONFIG_RESOLV_CONF_ENABLED_INIT (!OPENTHREAD_POSIX_CONFIG_ANDROID_ENABLE)
 #endif
 
+//---------------------------------------------------------------------------------------------------------------------
+// Removed or renamed POSIX specific configs.
+
+#ifdef OPENTHREAD_CONFIG_POSIX_APP_TREL_INTERFACE_NAME
+#error "OPENTHREAD_CONFIG_POSIX_APP_TREL_INTERFACE_NAME was removed (no longer applicable with TREL over DNS-SD)."
+#endif
+
+#ifdef OPENTHREAD_CONFIG_POSIX_TREL_USE_NETLINK_SOCKET
+#error "OPENTHREAD_CONFIG_POSIX_TREL_USE_NETLINK_SOCKET was removed (no longer applicable with TREL over DNS-SD)."
+#endif
+
 #endif // OPENTHREAD_PLATFORM_POSIX_CONFIG_H_

src/posix/platform/platform-posix.h

@@ -56,15 +56,6 @@
 #include "lib/spinel/coprocessor_type.h"
 #include "lib/url/url.hpp"
 
-/**
- * @def OPENTHREAD_POSIX_VIRTUAL_TIME
- *
- * This setting configures whether to use virtual time.
- */
-#ifndef OPENTHREAD_POSIX_VIRTUAL_TIME
-#define OPENTHREAD_POSIX_VIRTUAL_TIME 0
-#endif
-
 /**
  * This is the socket name used by daemon mode.
  */