MIPS: malta: Remove 'maybe_unused' attribute from ememsize{, _str}

MIPS: malta: Remove 'maybe_unused' attribute from ememsize{, _str}

First introduced in eec58f37606c1fa72735ce9c70ac38124d1b6c39
"MIPS: malta: malta-memory: Add support for the 'ememsize' variable"
but it is not needed since both variables are visible to the compiler.

Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Cc: <stable@vger.kernel.org> # v3.15+
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6985/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>