ARM: dts: Fix CLK_MOUT_CAMn parent clocks assignment for exynos4412-trats2

In order to get exact 24MHz clock frequency value for the camera
sensor and avoid rounding errors the parent clock must be CLK_XUSBXTI,
not CLK_MOUT_MPLL_USER_T.  Currently the sensor's master clock
frequency is too high and the sensor doesn't work properly.

This fixes commit 0357a443
("ARM: dts: Specify default clocks for Exynos4 camera devices").

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kukjin Kim <kgene@kernel.org>