sh: Use asm-generic/io.h

Convert the sh architecture to make use of the new asm-generic/io.h to
provide address mapping functions. As the generic implementations are
suitable for sh this is primarily a matter of moving code.

Feedback from architecture maintainers is welcome.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

sh4: remove __io config options from r2dplus and r7780mp boards

Defined __io is no-op for the SH architecture and it can be removed
from board files without any functional change.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

arm, nds32, sh: remove useless ioremap()/iounmap() defines

These defines are valid only when iomem_valid_addr is defined,
but I do not see such defines anywhere. Remove.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

sh: Add bit control functions

This provide bit control functions as clrbits_*, setbits_* and
clrsetbits_*.

V2: Fix comment style and error of whitespace.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Acked-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

Move architecture-specific includes to arch/$ARCH/include/asm

This helps to clean up the include/ directory so that it only contains
non-architecture-specific headers and also matches Linux's directory
layout which many U-Boot developers are already familiar with.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>