include: replace unifdef-y with header-y

unifdef-y and header-y has same semantic.
So there is no need to have both.

Drop the unifdef-y variant and sort all lines again

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/include/asm-generic/Kbuild.asm b/include/asm-generic/Kbuild.asm
index 96d7c98..c5d2e5d 100644
--- a/include/asm-generic/Kbuild.asm
+++ b/include/asm-generic/Kbuild.asm
@@ -1,5 +1,5 @@
 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/kvm.h \
-      		  $(srctree)/include/asm-$(SRCARCH)/kvm.h),)
+		  $(srctree)/include/asm-$(SRCARCH)/kvm.h),)
 header-y  += kvm.h
 endif
 
@@ -9,36 +9,37 @@
 endif
 
 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/a.out.h \
-      		  $(srctree)/include/asm-$(SRCARCH)/a.out.h),)
-unifdef-y += a.out.h
+		  $(srctree)/include/asm-$(SRCARCH)/a.out.h),)
+header-y += a.out.h
 endif
-unifdef-y += auxvec.h
-unifdef-y += byteorder.h
-unifdef-y += bitsperlong.h
-unifdef-y += errno.h
-unifdef-y += fcntl.h
-unifdef-y += ioctl.h
-unifdef-y += ioctls.h
-unifdef-y += ipcbuf.h
-unifdef-y += mman.h
-unifdef-y += msgbuf.h
-unifdef-y += param.h
-unifdef-y += poll.h
-unifdef-y += posix_types.h
-unifdef-y += ptrace.h
-unifdef-y += resource.h
-unifdef-y += sembuf.h
-unifdef-y += setup.h
-unifdef-y += shmbuf.h
-unifdef-y += sigcontext.h
-unifdef-y += siginfo.h
-unifdef-y += signal.h
-unifdef-y += socket.h
-unifdef-y += sockios.h
-unifdef-y += stat.h
-unifdef-y += statfs.h
-unifdef-y += swab.h
-unifdef-y += termbits.h
-unifdef-y += termios.h
-unifdef-y += types.h
-unifdef-y += unistd.h
+
+header-y += auxvec.h
+header-y += bitsperlong.h
+header-y += byteorder.h
+header-y += errno.h
+header-y += fcntl.h
+header-y += ioctl.h
+header-y += ioctls.h
+header-y += ipcbuf.h
+header-y += mman.h
+header-y += msgbuf.h
+header-y += param.h
+header-y += poll.h
+header-y += posix_types.h
+header-y += ptrace.h
+header-y += resource.h
+header-y += sembuf.h
+header-y += setup.h
+header-y += shmbuf.h
+header-y += sigcontext.h
+header-y += siginfo.h
+header-y += signal.h
+header-y += socket.h
+header-y += sockios.h
+header-y += stat.h
+header-y += statfs.h
+header-y += swab.h
+header-y += termbits.h
+header-y += termios.h
+header-y += types.h
+header-y += unistd.h