misc: bcm-vk: add mmap function for exposing BAR2

Add mmap function that allows host application to open up BAR2 memory
for remote spooling out messages from the VK logger.

Co-developed-by: Desmond Yan <[email protected]>
Acked-by: Olof Johansson <[email protected]>
Signed-off-by: Desmond Yan <[email protected]>
Signed-off-by: Scott Branden <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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