fbdev/core: Move procfs code to separate file

Move fbdev's procfs code into a separate file and contain it in
init and cleanup helpers. For the cleanup, replace remove_proc_entry()
with proc_remove(). It is equivalent in functionality, but looks
more like an inverse of proc_create_seq().

v2:
	* document proc_remove() usage (Sam)
	* revert unrelated removal of for_each_registered_fb()

Signed-off-by: Thomas Zimmermann <[email protected]>
Reviewed-by: Sam Ravnborg <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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