video: tegra: host: move vi_set_la() to tegra_vi.c

video: tegra: host: move vi_set_la() to tegra_vi.c

vi_set_la() in vi.c makes vi.c can't be built as a module. So move it
to tegra_vi.c which will always built in. And add a static mutex lock
for bandwidth operation in tegra_vi.c after removing struct vi_lock.

Bug 1349044

Change-Id: I7bfdfba1acbe4c1c7b3015561f948b98bc14e466
Signed-off-by: Bryan Wu <pengw@nvidia.com>
Reviewed-on: http://git-master/r/323622
Reviewed-by: Kushal Shah <kshah@nvidia.com>
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>