As of today 'include/arch/common/sys_io.h" has generic implementation
for MMIO accessors and memory bits manipulation functions. That leads
to several architectures like ARC, ARM/aarch64, ARM/aarch32/corter_a_r
redefine entire 'common/sys_io.h' even if they only have different
MMIO accessors implementation.
So split 'include/arch/common/sys_io.h" to
* sys_io.h - generic MMIO accessors
* sys_bitops.h - generic memory bits manipulation functions
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
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