MIPS: Fix alignment of quiet build output for vmlinuz link

The "LD vmlinuz" line in the quiet build output is misaligned with the
rest of the output. Fix this.

Signed-off-by: Alex Smith <alex.smith@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/11019/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>