vm-device, pci, devices: Remove InterruptSourceGroup::{un}mask

The calls to these functions are always preceded by a call to
InterruptSourceGroup::update(). By adding a masked boolean to that
function call it possible to remove 50% of the calls to the
KVM_SET_GSI_ROUTING ioctl as the the update will correctly handle the
masked or unmasked case.

This causes the ioctl to disappear from the perf report for a boot of
the VM.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>

devices/src/legacy/gpio_pl061.rs

@@ -356,6 +356,7 @@ mod tests {
             &self,
             _index: InterruptIndex,
             _config: InterruptSourceConfig,
+            _masked: bool,
         ) -> result::Result<(), std::io::Error> {
             Ok(())
         }

devices/src/legacy/rtc_pl031.rs

@@ -430,6 +430,7 @@ mod tests {
             &self,
             _index: InterruptIndex,
             _config: InterruptSourceConfig,
+            _masked: bool,
         ) -> result::Result<(), std::io::Error> {
             Ok(())
         }

devices/src/legacy/serial.rs

@@ -339,6 +339,7 @@ mod tests {
             &self,
             _index: InterruptIndex,
             _config: InterruptSourceConfig,
+            _masked: bool,
         ) -> result::Result<(), std::io::Error> {
             Ok(())
         }

devices/src/legacy/uart_pl011.rs

@@ -450,6 +450,7 @@ mod tests {
             &self,
             _index: InterruptIndex,
             _config: InterruptSourceConfig,
+            _masked: bool,
         ) -> result::Result<(), std::io::Error> {
             Ok(())
         }