iommu: Drop unnecessary of_iommu.h includes

The only place of_iommu.h is needed is in drivers/of/device.c. Remove it
from everywhere else.

Cc: Will Deacon <will@kernel.org>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Rob Clark <robdclark@gmail.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Yong Wu <yong.wu@mediatek.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Jean-Philippe Brucker <jean-philippe@linaro.org>
Cc: Frank Rowand <frowand.list@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: iommu@lists.linux-foundation.org
Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20210527193710.1281746-2-robh@kernel.org


Signed-off-by: Joerg Roedel <jroedel@suse.de>