dt-bindings: agilex: add NAND_X_CLK and NAND_ECC_CLK

Add the NAND_X_CLK and NAND_ECC_CLK clocks.

Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
Link: https://lore.kernel.org/r/20200616202417.14376-1-dinguyen@kernel.org


Signed-off-by: Stephen Boyd <sboyd@kernel.org>