spi: Add non DM version of SPI_MEM

Add non DM version of SPI_MEM to support easy migration to new SPI NOR
framework. This can be removed once DM_SPI conversion is complete.

Signed-off-by: Vignesh R <vigneshr@ti.com>
Tested-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Tested-by: Stefan Roese <sr@denx.de>
Tested-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
Tested-by: Jagan Teki <jagan@amarulasolutions.com> #zynq-microzed
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 4acec3e..3902671 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -11,6 +11,7 @@
 obj-$(CONFIG_SPI_MEM) += spi-mem.o
 else
 obj-y += spi.o
+obj-$(CONFIG_SPI_MEM) += spi-mem-nodm.o
 obj-$(CONFIG_SOFT_SPI) += soft_spi_legacy.o
 endif