arm: zynq: Enable debug uart on zc706

Enable debug uart by default.
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>

configs/zynq_zc706_defconfig

@@ -3,6 +3,7 @@ CONFIG_SYS_CONFIG_NAME="zynq_zc70x"
 CONFIG_ARCH_ZYNQ=y
 CONFIG_SYS_TEXT_BASE=0x4000000
 CONFIG_DEFAULT_DEVICE_TREE="zynq-zc706"
+CONFIG_DEBUG_UART=y
 CONFIG_FIT=y
 CONFIG_FIT_SIGNATURE=y
 CONFIG_FIT_VERBOSE=y
@@ -51,6 +52,10 @@ CONFIG_SPI_FLASH_SPANSION=y
 CONFIG_SPI_FLASH_STMICRO=y
 CONFIG_SPI_FLASH_WINBOND=y
 CONFIG_ZYNQ_GEM=y
+CONFIG_DEBUG_UART_ZYNQ=y
+CONFIG_DEBUG_UART_BASE=0xe0001000
+CONFIG_DEBUG_UART_CLOCK=50000000
+CONFIG_DEBUG_UART_ANNOUNCE=y
 CONFIG_ZYNQ_SERIAL=y
 CONFIG_ZYNQ_QSPI=y
 CONFIG_USB=y