drm/ofdrm: Depend on CONFIG_MMU

Add a dependency on CONFIG_MMU to ofdrm. The driver uses GEM SHMEM
helpers, which require MMU support. A reported error message [1] is
shown below.

   arm-linux-gnueabi-ld: drivers/gpu/drm/drm_gem_shmem_helper.o: in function `drm_gem_shmem_fault':
   >> drivers/gpu/drm/drm_gem_shmem_helper.c:562: undefined reference to `vmf_insert_pfn'

Reported-by: kernel test robot <[email protected]>
Signed-off-by: Thomas Zimmermann <[email protected]>
Reviewed-by: Javier Martinez Canillas <[email protected]>
Fixes: c8a17756c425 ("drm/ofdrm: Add ofdrm for Open Firmware framebuffers")
Cc: Thomas Zimmermann <[email protected]>
Cc: Javier Martinez Canillas <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: "Noralf Trønnes" <[email protected]>
Cc: Danilo Krummrich <[email protected]>
Cc: Michal Suchanek <[email protected]>
Cc: Daniel Vetter <[email protected]>
Link: https://lore.kernel.org/dri-devel/[email protected]/ # [1]
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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