nfs: fix PNFS_FLEXFILE_LAYOUT Kconfig default
This follows what was done in 8c2fabc6 . With the default being m, it's impossible to build the module into the kernel. Signed-off-by: Timo Rothenpieler <timo@rothenpieler.org> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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a38fd874