XDMA makefile: add option to set xdma config bar number config_bar_num=<N>

XDMA/linux-kernel/xdma/Makefile

@@ -2,6 +2,7 @@ SHELL = /bin/bash
 #
 # optional makefile parameters:
 # - DEBUG=<0|1>,	enable verbose debug print-out in the driver
+# - config_bar_num=,	xdma pci config bar number
 # - xvc_bar_num=,	xvc pci bar #
 # - xvc_bar_offset=,	xvc register base offset
 # 
@@ -23,6 +24,9 @@ EXTRA_CFLAGS := -I$(topdir)/include $(XVC_FLAGS)
 ifeq ($(DEBUG),1)
 	EXTRA_CFLAGS += -D__LIBXDMA_DEBUG__
 endif
+ifneq ($(config_bar_num),)
+	EXTRA_CFLAGS += -DXDMA_CONFIG_BAR_NUM=$(config_bar_num)
+endif
 #EXTRA_CFLAGS += -DINTERNAL_TESTING
 
 ifneq ($(KERNELRELEASE),)