arch/sim: Move the dummy foc driver to drivers/motor/foc

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

drivers/motor/foc/Kconfig

@@ -28,4 +28,10 @@ config MOTOR_FOC_TRACE
 	---help---
 		Enables FOC driver trace interface.
 
+config MOTOR_FOC_DUMMY
+	bool "Simulated FOC device"
+	default n
+	---help---
+		Build a simulated lower-half FOC device
+
 endif #MOTOR_FOC

drivers/motor/foc/Make.defs

@@ -22,6 +22,10 @@
 
 CSRCS += foc_dev.c
 
+ifeq ($(CONFIG_MOTOR_FOC_DUMMY),y)
+CSRCS += foc_dummy.c
+endif
+
 # Include FOC driver build support
 
 DEPPATH += --dep-path motor$(DELIM)foc