The software reset of the MAC needs a finer granularity. Some settings
in MACCR are kept.

Cc: Frederic Konrad <konrad.frederic@yahoo.fr>
Fixes: bd44300d ("net: add FTGMAC100 support")
Message-Id: <20200819100956.2216690-16-clg@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>