drm/fbdev-generic: Do not set physical framebuffer address

Framebuffer memory is allocated via vzalloc() from non-contiguous
physical pages. The physical framebuffer start address is therefore
meaningless. Do not set it.

The value is not used within the kernel and only exported to userspace
on dedicated ARM configs. No functional change is expected.

v2:
- refer to vzalloc() in commit message (Javier)

Signed-off-by: Thomas Zimmermann <[email protected]>
Fixes: a5b44c4adb16 ("drm/fbdev-generic: Always use shadow buffering")
Cc: Thomas Zimmermann <[email protected]>
Cc: Javier Martinez Canillas <[email protected]>
Cc: Zack Rusin <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: <[email protected]> # v6.4+
Reviewed-by: Javier Martinez Canillas <[email protected]>
Reviewed-by: Zack Rusin <[email protected]>
Reviewed-by: Sui Jingfeng <[email protected]>
Tested-by: Sui Jingfeng <[email protected]>
Acked-by: Maxime Ripard <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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