ARM64: zynqmp: Add debug uart for zc1751-dc1

It is helpful for debugging.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

configs/xilinx_zynqmp_zc1751_xm015_dc1_defconfig

@@ -41,6 +41,11 @@ CONFIG_SPI_FLASH_STMICRO=y
 CONFIG_SPI_FLASH_WINBOND=y
 CONFIG_DM_ETH=y
 CONFIG_ZYNQ_GEM=y
+CONFIG_DEBUG_UART=y
+CONFIG_DEBUG_UART_ZYNQ=y
+CONFIG_DEBUG_UART_BASE=0xff000000
+CONFIG_DEBUG_UART_CLOCK=100000000
+CONFIG_DEBUG_UART_ANNOUNCE=y
 CONFIG_USB=y
 CONFIG_USB_DWC3=y
 CONFIG_USB_DWC3_GADGET=y