uio: provide vm access to UIO_MEM_PHYS maps

This makes it possible to let gdb access mappings of the process that is
being debugged.

uio_mmap_logical was moved and uio_vm_ops renamed to group related code
and differentiate to new stuff.

CRs-Fixed: 570735
Change-Id: I8a5ff343727cc58fedfeb73f3466cc9a7f153e84
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Git-commit: 7294151d0592e0ff48c61fca9fd7c93d613134da
Git-repo: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git


Signed-off-by: Pratibhasagar V <pratibha@codeaurora.org>