ARM: at91/feature-removal-schedule: delay at91_mci removal

Delay sd/mmc driver at91_mci.c removal because of tight schedule to
move platform data to new driver atmel-mci.
Signed-off-by: NLudovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: NNicolas Ferre <nicolas.ferre@atmel.com>

Documentation/feature-removal-schedule.txt

@@ -579,7 +579,7 @@ Why:	KVM tracepoints provide mostly equivalent information in a much more
 ----------------------------
 
 What:	at91-mci driver ("CONFIG_MMC_AT91")
-When:	3.7
+When:	3.8
 Why:	There are two mci drivers: at91-mci and atmel-mci. The PDC support
 	was added to atmel-mci as a first step to support more chips.
 	Then at91-mci was kept only for old IP versions (on at91rm9200 and