Use Media Read message if possible on Gen8+

Use Media Read message if possible on Gen8+

AVS can't gurantee bit-match for a large surface. This fixes the
failure reported by gtest case Common/JPEGEncodeInputTest.Full/95.

before:
[  FAILED  ] Common/JPEGEncodeInputTest.Full/95, where GetParam() = (Fixed Size 7680x4320, 0x501176 pointing to "I420") (9239 ms)
[----------] 1 test from Common/JPEGEncodeInputTest (9239 ms total)

[----------] Global test environment tear-down
[==========] 1 test from 1 test case ran. (9361 ms total)
[  PASSED  ] 0 tests.
[  FAILED  ] 1 test, listed below:
[  FAILED  ] Common/JPEGEncodeInputTest.Full/95, where GetParam() = (Fixed Size 7680x4320, 0x501176 pointing to "I420")

after:
[       OK ] Common/JPEGEncodeInputTest.Full/95 (15250 ms)
[----------] 1 test from Common/JPEGEncodeInputTest (15250 ms total)

[----------] Global test environment tear-down
[==========] 1 test from 1 test case ran. (15365 ms total)
[  PASSED  ] 1 test.

Signed-off-by: Xiang, Haihao <haihao.xiang@intel.com>
Reviewed-by: Zhao Yakui <yakui.zhao@intel.com>
Tested-by: Sean V Kelley <seanvk@posteo.de>