MIPS: Declare mips_debugfs_dir in a header

We have many extern declarations of mips_debugfs_dir through arch/mips/
in various C files. Unify them by declaring mips_debugfs_dir in a
header, including it in each affected C file & removing the duplicate
declarations.

Signed-off-by: Paul Burton <[email protected]>
Cc: [email protected]
Cc: Steven J. Hill <[email protected]>
Cc: Alexander Sverdlin <[email protected]>
Cc: Masahiro Yamada <[email protected]>
Cc: Leonid Yegoshin <[email protected]>
Cc: Maciej W. Rozycki <[email protected]>
Cc: [email protected]
Cc: Joe Perches <[email protected]>
Cc: Jaedon Shin <[email protected]>
Cc: James Hogan <[email protected]>
Cc: David Daney <[email protected]>
Cc: Zubair Lutfullah Kakakhel <[email protected]>
Cc: Markos Chandras <[email protected]>
Cc: James Cowgill <[email protected]>
Patchwork: https://patchwork.linux-mips.org/patch/11181/
Signed-off-by: Ralf Baechle <[email protected]>

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