populate-extfs.sh: fix to handle special file names correctly
`debugfs' treats spaces and "" specially. So when we are dealing with
file names, great care should be taken to make sure that `debugfs'
recognizes file names correctly.
The basic solution here is:
1. Use quotation marks to handle spaces correctly.
2. Replace "xxx" with ""xxx"" so that debugfs knows that the quotation
marks are parts of the file name.
[YOCTO #6503]
Signed-off-by: Chen Qi <Qi.Chen@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
