core: Add a new hook PA_CORE_HOOK_CARD_PROFILE_CHANGED

This will allow modules to know when a card profile has changed
and take appropriate action. This might prove useful when developing
UCM so that the appropriate verb can be set.

src/pulsecore/core.h

@@ -113,6 +113,7 @@ typedef enum pa_core_hook {
     PA_CORE_HOOK_CARD_NEW,
     PA_CORE_HOOK_CARD_PUT,
     PA_CORE_HOOK_CARD_UNLINK,
+    PA_CORE_HOOK_CARD_PROFILE_CHANGED,
     PA_CORE_HOOK_MAX
 } pa_core_hook_t;