Fix Eth-Codes bitorder, Tests

Fixed bitorder of 10GbE and Ethernet compliance codes,
Added manipulation of individual bytes in FakeTCV
Removed unused variables form tests

Signed-off-by: Thomas Ruschival <thomas@ruschival.de>
Add read/write functions to transceiver

Allow direct access to non-msa specified data or other subdevices
- Write access only to registers >96
- Read access not yet sanity checked.

Signed-off-by: Thomas Ruschival <thomas@ruschival.de>