dm: MIGRATION: Update migration status for SPI

Now, we have few driver are fully converted into dm and few
are partially converted.

So, update the migration status accordingly.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/doc/driver-model/MIGRATION.txt b/doc/driver-model/MIGRATION.txt
index df659f3..d38be35 100644
--- a/doc/driver-model/MIGRATION.txt
+++ b/doc/driver-model/MIGRATION.txt
@@ -59,10 +59,7 @@
 	drivers/spi/cf_spi.c
 	drivers/spi/fsl_espi.c
 	drivers/spi/lpc32xx_ssp.c
-	drivers/spi/mpc8xx_spi.c
-	drivers/spi/mpc8xxx_spi.c
 	drivers/spi/mxs_spi.c
-	drivers/spi/sh_qspi.c
 	drivers/spi/sh_spi.c
 	drivers/spi/soft_spi_legacy.c
 
@@ -70,13 +67,12 @@
 	Deadline: 2019.04
 
 Partially converted:
-	drivers/spi/atcspi200_spi.c
 	drivers/spi/davinci_spi.c
 	drivers/spi/fsl_dspi.c
-	drivers/spi/fsl_qspi.c
 	drivers/spi/kirkwood_spi.c
 	drivers/spi/mxc_spi.c
 	drivers/spi/omap3_spi.c
+	drivers/spi/sh_qspi.c
 
 	Status: In progress
 	Deadline: 2019.07