ARM: shmobile: Stop using __raw_*() I/O accessors

There is no reason to keep on using the __raw_{read,write}l() I/O
accessors in Renesas ARM platform code.  Switch to using the plain
{read,write}l() I/O accessors, to have a chance that this works on
big-endian.

Suggested-by: Arnd Bergmann <arnd@kernel.org>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Link: https://lore.kernel.org/r/20201117142447.2205664-1-geert+renesas@glider.be