Abolish cpu_read* and cpu_write* accessors ...

Commit 2e6a88f2101d (add cpu native ordered io accessors) introduced
these macros and then commit be57f20cdd7d (Fix big endian MMIO
primitives) figured out they are equivalent to __raw_{read,write}*.

They turned out unnecessary after all.  Anyway, most source files
use __raw_read* and __raw_write*.

Let's replace a few remaining references and abolish them.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Fix big endian MMIO primitives. ...

cpu_read*() and cpu_wrire*() are precisely equal to __raw_read*() and
__raw_write*().

Striving for correctness we can replace all those __raw_*() with cpu_*()
as that's exactly what the former ones do.

Signed-off-by: Krzysztof Hałasa <khc@pm.waw.pl>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

add cpu native ordered io accessors ...

There are no generic native ordered io accessors. This sometimes
leads to

	v = in_be32(a);
	v = readl(a);

in generic drivers. Instead, use io accessors which are explicitely
native ordered.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

introduce io.h ...

To allow for some generic io accessors introduce io.h and use
this instead of asm/io.h throughout the tree.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>