You have to make sure these pins are aligned to each other.
pinmux.0x02440030 = 0x00000450; # dp_aux_ch0_hpd_pm0: dp, tristate-enable, input-enable, io_high_voltage-disable, lpdr-disable
pinmux.0x02440038 = 0x00000450; # dp_aux_ch1_hpd_pm1: dp, tristate-enable, input-enable, io_high_voltage-disable, lpdr-disable
pinmux.0x02440040 = 0x00000450; # dp_aux_ch2_hpd_pm2: dp, tristate-enable, input-enable, io_high_voltage-disable
Also, share me the dmesg on your custom carrier board.
And please refer to this thread to remove type c related in your dts. I guess you are not going to use typeC port +HDMI on your carrier board, right?