Implement read_many for denali.

rust/sys/denali/src/ahci/controller.rs

@@ -285,6 +285,16 @@ impl Command {
         })
     }
 
+    pub fn read_manual(lba: u64, lba_count: u16, paddr: u64) -> Self {
+        Self {
+            command: SataCommand::DmaReadExt,
+            lba,
+            sector_cnt: lba_count,
+            paddr: paddr,
+            memory_region: None,
+        }
+    }
+
     pub fn release_mem_cap(&mut self) -> u64 {
         self.memory_region.take().unwrap().release()
     }