misc: Fix clippy issues

Signed-off-by: Bo Chen <chen.bo@intel.com>

devices/src/acpi.rs

@@ -114,7 +114,7 @@ impl Aml for AcpiGedDevice {
                     &aml::ResourceTemplate::new(vec![&aml::AddressSpace::new_memory(
                         aml::AddressSpaceCachable::NotCacheable,
                         true,
-                        self.address.0 as u64,
+                        self.address.0,
                         self.address.0 + GED_DEVICE_ACPI_SIZE as u64 - 1,
                     )]),
                 ),

devices/src/legacy/serial.rs

@@ -199,7 +199,7 @@ impl Serial {
     }
 
     fn handle_write(&mut self, offset: u8, v: u8) -> Result<()> {
-        match offset as u8 {
+        match offset {
             DLAB_LOW if self.is_dlab_set() => {
                 self.baud_divisor = (self.baud_divisor & 0xff00) | u16::from(v)
             }