ARC: MWDT: drop incorrect -Hnocopyr linker option

-Hnocopyr option suppress copyright message in case of LDAC linker
but in case of LLDAC linker somehow it leads to partial linking
and generation output file with relocations. Looks like we
are converting MWDT option to LLVM option incorrectly in this
case. Among the partial linking itself it may cause build errors
when 'elf.get_dwarf_info' from 'gen_kobject_list.py' meets the
arch-specific relocation which isn't supported by 'elftools'

It requires future investigation, let's disable -Hnocopyr for now
to have elf image linked correctly.

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