Fix build break

error: 'class std::vector<char>' has no member named 'data'

Bug: 130246090
Test: make
Change-Id: I1c7146a6eada5be4aa0678c7a3ddb762d080c981
Merged-In: I39eec3b4d6621067387e48e1481de3cd614b79a1
Signed-off-by: Roman Kiryanov <rkir@google.com>

system/gralloc/gralloc.cpp

@@ -389,7 +389,7 @@ static void updateHostColorBuffer(cb_handle_t* cb,
     if ((doLocked && is_rgb_format) ||
         (!grdma && (doLocked || !is_rgb_format))) {
         convertedBuf.resize(rgbSz);
-        to_send = convertedBuf.data();
+        to_send = &convertedBuf.front();
         send_buffer_size = rgbSz;
     }