drm: add func to get max iomem address v2
it will be used to check if the driver needs swiotlb v2: Don't use inline, instead, move function to drm_memory.c (Michel Daenzer <michel@daenzer.net>) Signed-off-by: NChunming Zhou <david1.zhou@amd.com> Reviewed-by: NMonk Liu <monk.liu@amd.com> Reviewed-by: NChristian König <christian.koenig@amd.com> Reviewed-by: NMichel Dänzer <michel.daenzer@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180209024410.1469-1-david1.zhou@amd.com
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