Audio: Remove latency setting.

This setting only changes some internal values that are shown in tests not
to match PSP behavior.  Removed, it now matches how the PSP works.

This setting wasn't really affecting any actual audio latency.
See #11844.

Core/Config.cpp

@@ -785,7 +785,6 @@ static ConfigSetting graphicsSettings[] = {
 static ConfigSetting soundSettings[] = {
 	ConfigSetting("Enable", &g_Config.bEnableSound, true, true, true),
 	ConfigSetting("AudioBackend", &g_Config.iAudioBackend, 0, true, true),
-	ConfigSetting("AudioLatency", &g_Config.iAudioLatency, 1, true, true),
 	ConfigSetting("ExtraAudioBuffering", &g_Config.bExtraAudioBuffering, false, true, false),
 	ConfigSetting("AudioResampler", &g_Config.bAudioResampler, true, true, true),
 	ConfigSetting("GlobalVolume", &g_Config.iGlobalVolume, VOLUME_MAX, true, true),