fs/*/*.mk: fix code style

The header of the initramfs.mk file fits in one line, so rearrange it.
Remove consecutive empty line.

Signed-off-by: Ricardo Martincoski <ricardo.martincoski@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

fs/initramfs/initramfs.mk

@@ -1,7 +1,6 @@
 ################################################################################
 #
-# Build a kernel with an integrated initial ramdisk
-# filesystem based on cpio.
+# Build a kernel with an integrated initial ramdisk filesystem based on cpio.
 #
 ################################################################################
 

fs/iso9660/iso9660.mk

@@ -128,7 +128,6 @@ ROOTFS_ISO9660_PRE_GEN_HOOKS += ROOTFS_ISO9660_DISABLE_EXTERNAL_INITRD
 
 endif # ROOTFS_ISO9660_USE_INITRD
 
-
 define ROOTFS_ISO9660_CMD
 	$(HOST_DIR)/bin/genisoimage -J -R -b $(ROOTFS_ISO9660_BOOT_IMAGE) \
 		-no-emul-boot -boot-load-size 4 -boot-info-table \