drivers/gpu/intel: reflect insuff. quota to client

This patch prevents the driver from translating Insufficient_ram_quota
and Insufficient_cap_quota exceptions to Service_denied exceptions at
session-creation time. This enables the client to respond to such a
condition by retrying the session creation with increased session quota.

repos/os/src/drivers/gpu/intel/main.cc

@@ -1733,7 +1733,7 @@ class Gpu::Root : public Gpu::Root_component
 					                  session_diag_from_args(args),
 					                  _env.rm(), *md_alloc(), ram_quota,
 					                  *_device);
-			} catch (...) { throw Genode::Service_denied(); }
+			} catch (...) { throw; }
 		}
 
 		void _upgrade_session(Session_component *s, char const *args) override