Remove unused clean: target in various makefiles

Simple cleanup, kbuild does not use distributed clean target, so bettet get rid of them.

drivers/net/Makefile

@@ -194,5 +194,3 @@ obj-$(CONFIG_IRDA) += irda/
 
 include $(TOPDIR)/Rules.make
 
-clean:
-	rm -f core *.o *.a *.s

drivers/net/sk98lin/Makefile

@@ -59,11 +59,3 @@ EXTRA_CFLAGS += -I. -DSK_USE_CSUM $(DBGDEF)
 
 include $(TOPDIR)/Rules.make
 
-clean:
-	rm -f core *.o *.a *.s
-
-
-
-
-
-

drivers/net/skfp/Makefile

@@ -21,8 +21,3 @@ EXTRA_CFLAGS += -I. -DPCI -DMEM_MAPPED_IO -Wno-strict-prototypes
 
 include $(TOPDIR)/Rules.make
 
-clean:
-	rm -f core *.o *.a *.s
-
-
-

drivers/net/wan/lmc/Makefile

@@ -18,6 +18,3 @@ EXTRA_CFLAGS += -I. $(DBGDEF)
 
 include $(TOPDIR)/Rules.make
 
-clean:
-	rm -f core *.o *.a *.s
-

drivers/scsi/sym53c8xx_2/Makefile

@@ -7,5 +7,3 @@ EXTRA_CFLAGS += -I.
 
 include $(TOPDIR)/Rules.make
 
-clean:
-	rm -f *.o

drivers/video/matrox/Makefile

@@ -18,5 +18,3 @@ obj-$(CONFIG_FB_MATROX_MAVEN)     += matroxfb_maven.o matroxfb_crtc2.o
 
 include $(TOPDIR)/Rules.make
 
-clean:
-	rm -f core *.o *.a *.s

fs/umsdos/Makefile

@@ -8,9 +8,6 @@ umsdos-objs := dir.o  inode.o ioctl.o mangle.o namei.o rdir.o emd.o
 
 include $(TOPDIR)/Rules.make
 
-clean:
-	rm -f core *.o *.a *.s
-
 p:
 	proto *.c >/usr/include/linux/umsdos_fs.p