net: designware: Respect "bus mode" register contents on SW reset
"bus mode" register contains lots of fields and some of them don't expect to be written with 0 (zero). So since we're only interested in resetting MAC (which is done with setting the least significant bit of this register with "0") I believe it's better to modify only 1 bit of the register. Signed-off-by: NAlexey Brodkin <abrodkin@synopsys.com> Acked-by: NVipin Kumar <vipin.kumar@st.com> Patch: 277864
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