arm: zynq: Move ZYNQ_SERIAL to Kconfig

Move cadence/zynq serial driver via Kconfig

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/topic_miami_defconfig b/configs/topic_miami_defconfig
index 60623ff..38f2e4e 100644
--- a/configs/topic_miami_defconfig
+++ b/configs/topic_miami_defconfig
@@ -39,6 +39,7 @@
 CONFIG_DEBUG_UART_ZYNQ=y
 CONFIG_DEBUG_UART_BASE=0xe0000000
 CONFIG_DEBUG_UART_CLOCK=100000000
+CONFIG_ZYNQ_SERIAL=y
 CONFIG_ZYNQ_QSPI=y
 CONFIG_USB=y
 CONFIG_USB_EHCI_HCD=y