exynos: dp: Rename ptn3460 to match bindings

Rename the ptn3460 bridge entry of the device tree to match the bindings
in Documentation/devicetree/bindings/video/ptn3460.txt in kernel.

BUG=chrome-os-partner:10829
BUG=chrome-os-partner:11158
BUG=chrome-os-partner:12046
TEST=Tested on snow, screen came up in u-boot

Change-Id: I1f644e5632a81aad56d4bcac3f929cb0e2623a05
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/29343
Reviewed-by: Simon Glass <sjg@chromium.org>
2 files changed