ARC: HSDK-4xD: use active low polarity of cpu_start pulse

Add quirk for HSDK-4xD - due to HW issues HSDK can use any pulse
polarity but HSDK-4xD require active low polarity of cpu_start pulse.

So use low polarity of cpu_start pulse for both board.

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
1 file changed