iommu/shmobile: Remove unused include/linux/platform_data/sh_ipmmu.h header

include/linux/platform_data/sh_ipmmu.h is unused since commit

	ae50dc48 ("iommu/shmobile: Remove unused Renesas IPMMU/IPMMUI")

Let's remove it.

Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Joerg Roedel <jroedel@suse.de>