mm/memory.c: clarify a confusing comment for vm_iomap_memory

The param "start" actually referes to the physical memory start, which is
to be mapped into virtual area vma.  And it is the field vma->vm_start
which stands for the start of the area.

Most of the time, we do not read through whole implementation of a
function but only the definition and essential comments.  Accurate
comments are definitely the base stone.

Signed-off-by: Wang Wenhu <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Reviewed-by: Andrew Morton <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Linus Torvalds <[email protected]>

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