Revert "wic: Set a miniumum FAT16 volume size."

This reverts commit f7dfb4d43247d3c13a4e0a3853007d63b9512b83.

FAT16 volumes do not have a minimum size of 8250 blocks
(== slightly over 4MB).  Exhibit A: floppy disks.

The original commit message suggests this was a workaround for a bug in
parted - in which case we should fix it there, or use the wic
`--fixed-size` option to pass down an enforced minimum from a more
context-aware point in the callstack.

(From OE-Core rev: e0a1ae3863bc229512d43e4a5248551bf25950e5)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/lib/wic/partition.py

@@ -322,7 +322,7 @@ class Partition():
 
         dosfs_cmd = "mkdosfs %s -i %s %s %s -C %s %d" % \
                     (label_str, self.fsuuid, size_str, extraopts, rootfs,
-                     max(8250, rootfs_size))
+                     rootfs_size)
         exec_native_cmd(dosfs_cmd, native_sysroot)
 
         mcopy_cmd = "mcopy -i %s -s %s/* ::/" % (rootfs, rootfs_dir)