ARCv2: Don't pretend we may set L-bit in STATUS32 with kflag instruction

As per PRM "kflag" instruction doesn't change state of
L-flag ("Zero-Overhead loop disabled") in STATUS32 register
so let's not act as if we can affect this bit.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>