add Meizu M3, M6 TP, M6 SP and M6 SL dfu firmware recovery tool


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18360 a1c6a512-1295-4272-9138-f99709370657
diff --git a/utils/meizu_dfu/README b/utils/meizu_dfu/README
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+
+Meizu DFU tool for Linux
+
+This tool can restore the firmware on M3, M6 SP, M6 TP and M6 SL.
+
+Notes:
+1. SST39VF800.dfu is taken from the official dfu tool provided by Meizu.
+2. updateNAND_BE_070831.dfu is taken from the unofficial dfu tool for M6 SL.
+3. To compile, just run `make'.
+