prj.conf errors when trying to configure a custom nrf5340 board for High Voltage DC-DC mode

I am using 2.9.1 toolchain and sdk with a custom nrf5340 board and trying to use High Voltage (HV) with DC-DC mode. I don't know much about it as I have been using a nrf5340 DK for prototyping but read the documentation and am trying to figure it out.

I read this post on How to turn on nrf5340 DCDC but when I add these settings to the prj.conf:

CONFIG_BOARD_ENABLE_DCDC_APP=y
CONFIG_BOARD_ENABLE_DCDC_NET=y
CONFIG_BOARD_ENABLE_DCDC_HV=y

but am getting these errors:

/Users/********/Projects/GitHub/********/pcb_test/prj.conf:32: warning: attempt to assign the value 'y' to the undefined symbol BOARD_ENABLE_DCDC_APP
/Users/********/Projects/GitHub/********/pcb_test/prj.conf:33: warning: attempt to assign the value 'y' to the undefined symbol BOARD_ENABLE_DCDC_NET
/Users/********/Projects/GitHub/********/pcb_test/prj.conf:34: warning: attempt to assign the value 'y' to the undefined symbol BOARD_ENABLE_DCDC_HV

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