[INKA4x0] NG hardware: flash support

Disabled and remove inka4x0 custom flash driver, use CFI flash
driver instead.

Signed-off-by: Marian Balakowicz <m8@semihalf.com>
diff --git a/board/inka4x0/Makefile b/board/inka4x0/Makefile
index 8aa7e7c..ddfd2ef 100644
--- a/board/inka4x0/Makefile
+++ b/board/inka4x0/Makefile
@@ -25,7 +25,7 @@
 
 LIB	= $(obj)lib$(BOARD).a
 
-COBJS	:= $(BOARD).o flash.o
+COBJS	:= $(BOARD).o
 
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))