xilinx: zynqmp: synchronize firmware call return payload

Removes duplicated definition of PAYLOAD_ARG_CNT and define it in the
firmware driver. Additionally fixes payload buffer declarations without
macro usage

Signed-off-by: Ibai Erkiaga <ibai.erkiaga-elorza@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/drivers/fpga/versalpl.c b/drivers/fpga/versalpl.c
index 8e2ef4f..c44a7d3 100644
--- a/drivers/fpga/versalpl.c
+++ b/drivers/fpga/versalpl.c
@@ -32,7 +32,7 @@
 	ulong bin_buf;
 	int ret;
 	u32 buf_lo, buf_hi;
-	u32 ret_payload[5];
+	u32 ret_payload[PAYLOAD_ARG_CNT];
 
 	bin_buf = versal_align_dma_buffer((ulong *)buf, bsize);