video, ipu: make ldb_clock configurable
make the ldb_clock configurable through the new define CONFIG_SYS_LDB_CLOCK. This is needed as the ldb clock is not always 650000000, for example on the aristainetos2 board, where the ldb clock derives from PLL5 clock. Signed-off-by: NHeiko Schocher <hs@denx.de> Tested-by: NEric Nelson <eric.nelson@boundarydevices.com>
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