drm/panfrost: Make sure a BO is only unmapped when appropriate

mmu_ops->unmap() will fail when called on a BO that has not been
previously mapped, and the error path in panfrost_ioctl_create_bo()
can call drm_gem_object_put_unlocked() (which in turn calls
panfrost_mmu_unmap()) on a BO that has not been mapped yet.

Keep track of the mapped/unmapped state to avoid such issues.

Fixes: f3ba91228e8e ("drm/panfrost: Add initial panfrost driver")
Cc: <[email protected]>
Signed-off-by: Boris Brezillon <[email protected]>
Signed-off-by: Rob Herring <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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