ARM: shmobile: r8a7779: Remove obsolete static mappings

There are no more users of the statically mapped IOMEM regions on R-Car
H1.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20201117103022.2136527-5-geert+renesas@glider.be