la plugin: fix allocation of aux pool on init
la plugin: fix allocation of aux pool on init

m_raw used for copy surfaces to video memory in case of system input.
If DS factor > 1, then we alloc pool with wrong size, because we already
changed request. Moved allocation into correct place.

Intel-Media-SDK/MediaSDK,Intel-Media-SDK/MediaSDK,Intel-Media-SDK/MediaSDK,Intel-Media-SDK/MediaSDK,Intel-Media-SDK/MediaSDK