The do_gettimeofday() helper was removed by commit e4b92b108c6c
("timekeeping: remove obsolete time accessors") in v5.0-rc1. Bring it back
for users in vmnet-only/bridge.c
Note that Workstation/Player 15.1.0 did in fact resolve the absence of
do_gettimeofday() in kernel 5.0 and newer but it did so only for calls in
vmmon-only/linux/hostif.c. Calls in vmnet-only/bridge.c were left in place
as those are only compiled when building with LOGLEVEL >= 4.