CLK: ARC: HSDK: define clock map with DT binding constants

CLK: ARC: HSDK: define clock map with DT binding constants

Define clock map with DT binding constants so clock map can be
discontinuous.

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