ARM: tegra11: pluto: Fix inconsistent return value for imx091

ARM: tegra11: pluto: Fix inconsistent return value for imx091

The power on function for imx091 returns different
values in Dalmore and Pluto board files. Both of them
should return 1 for success.

Bug 1188605

Change-Id: I4587040e0752aae6afa13af819461fcf03932686
Reviewed-on: http://git-master/r/204739
(cherry picked from commit 98212602c5a3bba911f92bfb711fc2af4f839261)
Signed-off-by: Frank Chen <frankc@nvidia.com>
Reviewed-on: http://git-master/r/206010
Reviewed-by: Harshada Kale <hkale@nvidia.com>
Tested-by: Harshada Kale <hkale@nvidia.com>