arm64: versal: Add versal specific cadence ospi driver

Add support for cadence ospi driver for Versal platform. This driver
provides support for DMA read operation which utilizes cadence qspi
driver.
If "cdns,is-dma" DT property is specified use dma for read operation
from cadence_qspi driver. As cadence_qspi_apb_dma_read() is defined in
cadence_ospi_versal driver add a weak function defination in
cadence_qspi driver.

Signed-off-by: T Karthik Reddy <t.karthik.reddy@xilinx.com>
Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@xilinx.com>
Link: https://lore.kernel.org/r/20220512100535.16364-3-ashok.reddy.soma@xilinx.com
Signed-off-by: Michal Simek <michal.simek@amd.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index bfa3bfb..4b74866 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -640,6 +640,7 @@
 F:	arch/arm/mach-versal/
 F:	drivers/net/xilinx_axi_mrmac.*
 F:	drivers/soc/soc_xilinx_versal.c
+F:	drivers/spi/cadence_ospi_versal.c
 F:	drivers/watchdog/xilinx_wwdt.c
 N:	(?<!uni)versal