rename write,read to writeMeta,readMeta

The blobs::DataInterface specifies two methods, write and read which are
meant to be implemented to write or read configuration for the data
interface implementation.

Change-Id: I831a8611596fca50570a4156cbdcfa5c810c0315
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/test/firmware_sessionstat_unittest.cpp b/test/firmware_sessionstat_unittest.cpp
index 42f67e6..4f6584f 100644
--- a/test/firmware_sessionstat_unittest.cpp
+++ b/test/firmware_sessionstat_unittest.cpp
@@ -83,7 +83,7 @@
     int size = 512;
     EXPECT_CALL(imageMock2, getSize()).WillOnce(Return(size));
     std::vector<std::uint8_t> mBytes = {0x01, 0x02};
-    EXPECT_CALL(dataMock, read()).WillOnce(Return(mBytes));
+    EXPECT_CALL(dataMock, readMeta()).WillOnce(Return(mBytes));
 
     struct BlobMeta meta;
     EXPECT_TRUE(handler->stat(0, &meta));