arm64: zynqmp: Reduce console buffer size

Reduce console buffer size to 1kbyte to accommodate memory
allocations in mini u-boot for zynqmp.
Signed-off-by: NT Karthik Reddy <t.karthik.reddy@xilinx.com>
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>

include/configs/xilinx_zynqmp_mini.h

@@ -24,5 +24,7 @@
 /* BOOTP options */
 #undef CONFIG_BOOTP_BOOTFILESIZE
 #undef CONFIG_BOOTP_MAY_FAIL
+#undef CONFIG_SYS_CBSIZE
+#define CONFIG_SYS_CBSIZE		1024
 
 #endif /* __CONFIG_ZYNQMP_MINI_H */