toolchain-external: bump CodeSourcery NIOSII to 2018.05

Re-add BR2_TOOLCHAIN_HAS_SSP since the toolchain support SSP.

Tested with qemu_nios2_10m50_defconfig and Qemu 2.10.1-3.fc27 release.

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
3 files changed