CC2538: use uart1 on pin C0 C1 issue

I use CC2538 on my own board, and I use cc2538_foundation_firmware_1_0_1_0 uart example

I have  questions

1. Can I use pin? follow this

PC0 = uart1 RX

PC1 = uart1 TX

PC2 = uart RTS

PC3 =  uart CTS

2. I see in code where is GPIOPinTypeUARTHiDrive()