ARC: HSDK: Fix CPU frequency value

CPU on HSDK board runs at 500MHz after preloader so fix
wrong CPU frequency value in hsdk_defconfig.

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