drivers: convert makefiles to Kbuild style

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/drivers/block/Makefile b/drivers/block/Makefile
index 2016e98..4e94378 100644
--- a/drivers/block/Makefile
+++ b/drivers/block/Makefile
@@ -5,40 +5,18 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-include $(TOPDIR)/config.mk
-
-LIB	:= $(obj)libblock.o
-
-COBJS-$(CONFIG_SCSI_AHCI) += ahci.o
-COBJS-$(CONFIG_ATA_PIIX) += ata_piix.o
-COBJS-$(CONFIG_DWC_AHSATA) += dwc_ahsata.o
-COBJS-$(CONFIG_FSL_SATA) += fsl_sata.o
-COBJS-$(CONFIG_IDE_FTIDE020) += ftide020.o
-COBJS-$(CONFIG_LIBATA) += libata.o
-COBJS-$(CONFIG_MVSATA_IDE) += mvsata_ide.o
-COBJS-$(CONFIG_MX51_PATA) += mxc_ata.o
-COBJS-$(CONFIG_PATA_BFIN) += pata_bfin.o
-COBJS-$(CONFIG_SATA_DWC) += sata_dwc.o
-COBJS-$(CONFIG_SATA_SIL3114) += sata_sil3114.o
-COBJS-$(CONFIG_SATA_SIL) += sata_sil.o
-COBJS-$(CONFIG_IDE_SIL680) += sil680.o
-COBJS-$(CONFIG_SCSI_SYM53C8XX) += sym53c8xx.o
-COBJS-$(CONFIG_SYSTEMACE) += systemace.o
-
-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 $(obj).depend
-
-#########################################################################
+obj-$(CONFIG_SCSI_AHCI) += ahci.o
+obj-$(CONFIG_ATA_PIIX) += ata_piix.o
+obj-$(CONFIG_DWC_AHSATA) += dwc_ahsata.o
+obj-$(CONFIG_FSL_SATA) += fsl_sata.o
+obj-$(CONFIG_IDE_FTIDE020) += ftide020.o
+obj-$(CONFIG_LIBATA) += libata.o
+obj-$(CONFIG_MVSATA_IDE) += mvsata_ide.o
+obj-$(CONFIG_MX51_PATA) += mxc_ata.o
+obj-$(CONFIG_PATA_BFIN) += pata_bfin.o
+obj-$(CONFIG_SATA_DWC) += sata_dwc.o
+obj-$(CONFIG_SATA_SIL3114) += sata_sil3114.o
+obj-$(CONFIG_SATA_SIL) += sata_sil.o
+obj-$(CONFIG_IDE_SIL680) += sil680.o
+obj-$(CONFIG_SCSI_SYM53C8XX) += sym53c8xx.o
+obj-$(CONFIG_SYSTEMACE) += systemace.o