video, ipu: make ldb clock frequency overwritable through board code
the ldb clock can be setup in board code (for example set through PLL5). Update the ldb_clock rate also through board code. This should be removed, if a clock framework is availiable. Signed-off-by: NHeiko Schocher <hs@denx.de> Tested-by: NEric Nelson <eric.nelson@boundarydevices.com>
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