samples: suit: Fix the scheduler name

Zephyr has renamed from dumb->simple.

Signed-off-by: Chaitanya Tata <[email protected]>

Author: krish2718

samples/suit/flash_companion/prj.conf

@@ -9,8 +9,8 @@ CONFIG_NUM_PREEMPT_PRIORITIES=0
 CONFIG_MULTITHREADING=y
 CONFIG_NUM_COOP_PRIORITIES=16
 CONFIG_NUM_METAIRQ_PRIORITIES=0
-CONFIG_SCHED_DUMB=y
-CONFIG_WAITQ_DUMB=y
+CONFIG_SCHED_SIMPLE=y
+CONFIG_WAITQ_SIMPLE=y
 
 # Enable peripherals needed by the flash companion firmware
 CONFIG_GPIO=y