meta-ampere: u-boot: Disable internal PD resistors for GPIOs

Configure SCU8C - Multi-function pin control 4 to disable internal pull
down resistors for GPIOJ, GPIOG/GPIOAB, GPIOD/GPIOY, GPIOC/GPIOS as
external resistors are already installed.

Tested: scan I2C4 and check devices on the bus are detected

Signed-off-by: Thinh Pham <thinh.pham@amperecomputing.com>
Signed-off-by: Thang Q. Nguyen <thang@os.amperecomputing.com>
Change-Id: I5a4b682310b5243830bd9c7a66889b0a52c4770c
2 files changed