warning: implicit declaration of function

Hello, 

I want to use McuBoot so I added  CONFIG_BOOTLOADER_MCUBOOT=y to prj.conf.

So there were a lot of warnings "implicit declaration of function ".

Part of the warning is below.

I think these warnings is happend in ncs/v2.6.0 but I don't know why these happen just by adding CONFIG_BOOTLOADER_MCUBOOT=y .
please tell me why these happen and tell me something how to solve this problem.

Best regards.

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