drivers: usb: convert makefiles to Kbuild style

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index afaf5ce..f52d3f4 100644
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -5,59 +5,37 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-include $(TOPDIR)/config.mk
-
-LIB	:= $(obj)libusb_gadget.o
-
 # if defined(CONFIG_USB_GADGET) || defined(CONFIG_USB_ETHER)
 #   Everytime you forget how crufty makefiles can get things like
 #   this remind you...
 ifneq (,$(CONFIG_USB_GADGET)$(CONFIG_USB_ETHER))
-COBJS-y += epautoconf.o config.o usbstring.o
+obj-y += epautoconf.o config.o usbstring.o
 endif
 
 # new USB gadget layer dependencies
 ifdef CONFIG_USB_GADGET
-COBJS-$(CONFIG_USB_GADGET_ATMEL_USBA) += atmel_usba_udc.o
-COBJS-$(CONFIG_USB_GADGET_S3C_UDC_OTG) += s3c_udc_otg.o
-COBJS-$(CONFIG_USB_GADGET_FOTG210) += fotg210.o
-COBJS-$(CONFIG_THOR_FUNCTION) += f_thor.o
-COBJS-$(CONFIG_USBDOWNLOAD_GADGET) += g_dnl.o
-COBJS-$(CONFIG_DFU_FUNCTION) += f_dfu.o
-COBJS-$(CONFIG_USB_GADGET_MASS_STORAGE) += f_mass_storage.o
+obj-$(CONFIG_USB_GADGET_ATMEL_USBA) += atmel_usba_udc.o
+obj-$(CONFIG_USB_GADGET_S3C_UDC_OTG) += s3c_udc_otg.o
+obj-$(CONFIG_USB_GADGET_FOTG210) += fotg210.o
+obj-$(CONFIG_THOR_FUNCTION) += f_thor.o
+obj-$(CONFIG_USBDOWNLOAD_GADGET) += g_dnl.o
+obj-$(CONFIG_DFU_FUNCTION) += f_dfu.o
+obj-$(CONFIG_USB_GADGET_MASS_STORAGE) += f_mass_storage.o
 endif
 ifdef CONFIG_USB_ETHER
-COBJS-y += ether.o
-COBJS-$(CONFIG_USB_ETH_RNDIS) += rndis.o
-COBJS-$(CONFIG_MV_UDC)	+= mv_udc.o
-COBJS-$(CONFIG_CPU_PXA25X) += pxa25x_udc.o
+obj-y += ether.o
+obj-$(CONFIG_USB_ETH_RNDIS) += rndis.o
+obj-$(CONFIG_MV_UDC)	+= mv_udc.o
+obj-$(CONFIG_CPU_PXA25X) += pxa25x_udc.o
 else
 # Devices not related to the new gadget layer depend on CONFIG_USB_DEVICE
 ifdef CONFIG_USB_DEVICE
-COBJS-y += core.o
-COBJS-y += ep0.o
-COBJS-$(CONFIG_DW_UDC) += designware_udc.o
-COBJS-$(CONFIG_OMAP1510) += omap1510_udc.o
-COBJS-$(CONFIG_OMAP1610) += omap1510_udc.o
-COBJS-$(CONFIG_MPC885_FAMILY) += mpc8xx_udc.o
-COBJS-$(CONFIG_CPU_PXA27X) += pxa27x_udc.o
+obj-y += core.o
+obj-y += ep0.o
+obj-$(CONFIG_DW_UDC) += designware_udc.o
+obj-$(CONFIG_OMAP1510) += omap1510_udc.o
+obj-$(CONFIG_OMAP1610) += omap1510_udc.o
+obj-$(CONFIG_MPC885_FAMILY) += mpc8xx_udc.o
+obj-$(CONFIG_CPU_PXA27X) += pxa27x_udc.o
 endif
 endif
-
-COBJS	:= $(COBJS-y)
-SRCS	:= $(COBJS:.o=.c)
-OBJS	:= $(addprefix $(obj),$(COBJS))
-
-all:	$(LIB)
-
-$(LIB):	$(obj).depend $(OBJS)
-	$(call cmd_link_o_target, $(OBJS))
-
-#########################################################################
-
-# defines $(obj).depend target
-include $(SRCTREE)/rules.mk
-
-sinclude $(obj).depend
-
-#########################################################################