add dts config

hc

2023-12-06 08f87f769b595151be1afeff53e144f543faa614

 kernel/drivers/rkflash/rkflash_api.h
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@@ -41,7 +41,7 @@
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 	int (*discard)(u32 sec, u32 n_sec);
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 };
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-#ifdef CONFIG_RK_NANDC_NAND
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+#if IS_REACHABLE(CONFIG_RK_NANDC_NAND)
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 extern const struct flash_boot_ops nandc_nand_ops;
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 #endif
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