pci: make VirtIO logging less verbose

Every time we were handling an MMIO write within a VirtIO device's BAR
we were logging a debug-level message when the write was not leading to
a device activation. This leads to way too verbose Firecracker logs up
until a device was set up properly. These logs don't really provide any
useful debugging information, so just drop it to keep logs readable.

Signed-off-by: Babis Chalios <bchalios@amazon.es>

Author: bchalios

src/vmm/src/devices/virtio/transport/pci/device.rs

@@ -938,8 +938,6 @@ impl PciDevice for VirtioPciDevice {
                     let _ = interrupt.trigger(VirtioInterruptType::Config);
                 }
             }
-        } else {
-            debug!("Device doesn't need activation");
         }
 
         // Device has been reset by the driver