MIPS: Replace `-' in defconfig filename wth `_' for consistency.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/configs/cavium-octeon_defconfig b/arch/mips/configs/cavium_octeon_defconfig
similarity index 100%
rename from arch/mips/configs/cavium-octeon_defconfig
rename to arch/mips/configs/cavium_octeon_defconfig

diff --git a/arch/mips/configs/pnx8335-stb225_defconfig b/arch/mips/configs/pnx8335_stb225_defconfig
similarity index 100%
rename from arch/mips/configs/pnx8335-stb225_defconfig
rename to arch/mips/configs/pnx8335_stb225_defconfig

diff --git a/arch/mips/configs/pnx8550-jbs_defconfig b/arch/mips/configs/pnx8550_jbs_defconfig
similarity index 100%
rename from arch/mips/configs/pnx8550-jbs_defconfig
rename to arch/mips/configs/pnx8550_jbs_defconfig

diff --git a/arch/mips/configs/pnx8550-stb810_defconfig b/arch/mips/configs/pnx8550_stb810_defconfig
similarity index 100%
rename from arch/mips/configs/pnx8550-stb810_defconfig
rename to arch/mips/configs/pnx8550_stb810_defconfig

diff --git a/arch/mips/configs/sb1250-swarm_defconfig b/arch/mips/configs/sb1250_swarm_defconfig
similarity index 100%
rename from arch/mips/configs/sb1250-swarm_defconfig
rename to arch/mips/configs/sb1250_swarm_defconfig