functions.common: retry on reset_primary_mac if value is loopback dev
functions.common: retry on reset_primary_mac if value is loopback dev

When checking for a valid primaryethaddr, always retry if the value
matches 000000000000 (i.e. loopback device)

Signed-off-by: Alejandro del Castillo <c09cbcd73cd5840fe009d82a3ad13af11b4d7b46@ni.com>
Natinst-CAR-ID: 504771
Natinst-ReviewBoard-ID: 85937

ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt