ARM: dts: imx: b450/b650v3: Move ldb_di clk assignment

Previously the LDB_DIx clocks could be specified in the ldb node. With
the ERR009219 errata fix applied, the ldb_di clocks now needs to be
specified in the clks node to ensure the clocks are setup early in the
boot process.

Signed-off-by: Akshay Bhat <akshay.bhat@timesys.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>