ARM: io.h: Make RTB logging hooks sparse friendly

Casting a void __iomem pointer to void causes sparse warnings.
Force the cast and pass the original pointer to the no_log
variants of the read/write io functions so that sparse is quiet.

Change-Id: I6c72d944b7707c29d18b08951a19b34bad269540
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>