[client] egl: added DMA texture support for direct upload

Note: This only works with the KVMFR kernel module in a VM->VM
configuration. If this causes issues it can be disabled with the new
option `app:allowDMA`

client/src/main.h

@@ -158,6 +158,7 @@ struct AppParams
 
   unsigned int cursorPollInterval;
   unsigned int framePollInterval;
+  bool         allowDMA;
 
   bool         forceRenderer;
   unsigned int forceRendererIndex;