linux-user: Fix target_flock structure for MIPS O64 ABI

linux-user: Fix target_flock structure for MIPS O64 ABI

Among MIPS ABIs, only MIPS O32 and N32 have special (different
than other architectures) definition of structure flock in kernel.

Bring target_flock definition in QEMU for MIPS O64 ABI to the
correct state, which is currently different than the most common
definition, and it should actually be the same.

Reported-by: Dragan Mladjenovic <[email protected]>
Signed-off-by: Aleksandar Markovic <[email protected]>
Reviewed-by: Laurent Vivier <[email protected]>
Message-Id: <1561718618[email protected]>
Signed-off-by: Laurent Vivier <[email protected]>