ARC: fix compilation without dcache

"__arc_dcache_inv_lines" was improperly defined in case of disabled data
cache - with 3 arguments instead of 4 as in its real implementation.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Suggested-by: Nagesh Akula <nagesh.akula@smachines.com>