spi: zynqmp_gqspi: Add parallel memories support in GQSPI driver

Add support for parallel memories in zynqmp_gqspi.c driver. In case of
parallel memories STRIPE bit is set and sent to the qspi ip, which will
send data bits to both the flashes in parallel. However for few commands
we should not use stripe, instead send same data to both the flashes.
Those commands are exclueded by using zynqmp_qspi_update_stripe().

Also update copyright info for this file.

Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@amd.com>
Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@amd.com>
diff --git a/include/spi.h b/include/spi.h
index b714886..3a92d02 100644
--- a/include/spi.h
+++ b/include/spi.h
@@ -38,6 +38,9 @@
 
 #define SPI_DEFAULT_WORDLEN	8
 
+#define SPI_3BYTE_MODE 0x0
+#define SPI_4BYTE_MODE 0x1
+
 /* SPI transfer flags */
 #define SPI_XFER_STRIPE	(1 << 6)
 #define SPI_XFER_MASK	(3 << 8)
@@ -172,6 +175,7 @@
 	 * at once.
 	 */
 	bool multi_cs_cap;
+	u32 bytemode;
 };
 
 /**