Adjust virtio_blk API for virtio-drivers 0.6.0

Bug: 291586508
Test: atest vmbase_example.integration_test
Test: m pvmfw_img
Change-Id: Ie3c25a6524f3b7b2ca88ad303d11c86d4e49d44b
diff --git a/vmbase/example/src/pci.rs b/vmbase/example/src/pci.rs
index 26bc29b..b838539 100644
--- a/vmbase/example/src/pci.rs
+++ b/vmbase/example/src/pci.rs
@@ -78,7 +78,7 @@
             assert_eq!(blk.capacity(), EXPECTED_SECTOR_COUNT as u64);
             let mut data = [0; SECTOR_SIZE_BYTES * EXPECTED_SECTOR_COUNT];
             for i in 0..EXPECTED_SECTOR_COUNT {
-                blk.read_block(i, &mut data[i * SECTOR_SIZE_BYTES..(i + 1) * SECTOR_SIZE_BYTES])
+                blk.read_blocks(i, &mut data[i * SECTOR_SIZE_BYTES..(i + 1) * SECTOR_SIZE_BYTES])
                     .expect("Failed to read block device.");
             }
             for (i, chunk) in data.chunks(size_of::<u32>()).enumerate() {
@@ -89,7 +89,7 @@
         1 => {
             assert_eq!(blk.capacity(), 0);
             let mut data = [0; SECTOR_SIZE_BYTES];
-            assert_eq!(blk.read_block(0, &mut data), Err(Error::IoError));
+            assert_eq!(blk.read_blocks(0, &mut data), Err(Error::IoError));
         }
         _ => panic!("Unexpected VirtIO block device index {}.", index),
     }