serial: zynq: Remove header depedency on arm header structure

There is no need to have arm hardware header in this driver.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/drivers/serial/serial_zynq.c b/drivers/serial/serial_zynq.c
index af9790d..06f0a48 100644
--- a/drivers/serial/serial_zynq.c
+++ b/drivers/serial/serial_zynq.c
@@ -14,7 +14,6 @@
 #include <asm/io.h>
 #include <linux/compiler.h>
 #include <serial.h>
-#include <asm/arch/hardware.h>
 
 #define ZYNQ_UART_SR_TXEMPTY	(1 << 3) /* TX FIFO empty */
 #define ZYNQ_UART_SR_TXACTIVE	(1 << 11)  /* TX active */