doc: driver-model: Update SPI migration status

All SPI drivers are converted to DM_SPI but 3 drivers
still operate in nondm mode for SPL due to footprint
constraints.

Update the migration status for it.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/doc/driver-model/migration.rst b/doc/driver-model/migration.rst
index de8c1f9..2284e8a 100644
--- a/doc/driver-model/migration.rst
+++ b/doc/driver-model/migration.rst
@@ -66,28 +66,15 @@
 Board Maintainers should submit the patches for enabling DM_SPI and DM_SPI_FLASH
 to move the migration with in the deadline.
 
-No dm conversion yet::
-
-	drivers/spi/fsl_espi.c
-	drivers/spi/soft_spi_legacy.c
-
-* Status: In progress
-* Deadline: 2019.04
-
 Partially converted::
 
-	drivers/spi/davinci_spi.c
-	drivers/spi/fsl_dspi.c
-	drivers/spi/kirkwood_spi.c
+	drivers/spi/fsl_espi.c
 	drivers/spi/mxc_spi.c
-	drivers/spi/mxs_spi.c
-	drivers/spi/omap3_spi.c
 	drivers/spi/sh_qspi.c
 
 * Status: In progress
 * Deadline: 2019.07
 
-
 CONFIG_DM_PCI
 -------------
 Deadline: 2019.07