RT #74595. Moved STM32-specific fscm.c to stm32/, as it breaks the builds

for non-STM32 targets.

cpu/arm_cortexm3/Makefile

@@ -30,7 +30,7 @@ include $(TOPDIR)/config.mk
 LIB	= $(obj)lib$(CPU).a
 
 START	:= start.o
-COBJS	:= cpu.o cmd_cptf.o timer.o fsmc.o
+COBJS	:= cpu.o cmd_cptf.o timer.o
 
 SRCS	:= $(START:.o=.c) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))

cpu/arm_cortexm3/stm32/Makefile

@@ -29,7 +29,7 @@ include $(TOPDIR)/config.mk
 
 LIB	= $(obj)lib$(SOC).a
 
-COBJS	:= clock.o cpu.o envm.o wdt.o
+COBJS	:= clock.o cpu.o envm.o wdt.o fsmc.o
 SOBJS	:=
 
 SRCS	:= $(COBJS:.o=.c)