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The clocks in the example use 'SCLK_DDRCLK', which does not exist in
the rk3399-cru.h, correct it to 'SCLK_DDRC'.

Ref: commit 7fbdfcd6 ("clk: rockchip: add SCLK_DDRC id for rk3399 ddrc")
Fixes: c1ceb8f7

 ("Documentation: bindings: add dt documentation for rk3399 dmc")
Signed-off-by: Chukun Pan <amadeus@jmu.edu.cn>
Link: https://lore.kernel.org/r/20211001150024.18672-1-amadeus@jmu.edu.cn

Signed-off-by: Rob Herring <robh@kernel.org>