toolchain-external: add CodeSourcery MIPS 2014.11, remove 2013.05

- Add CodeSourcery MIPS 2014.11 toolchain
- Remove CodeSourcery MIPS 2013.05 toolchain
- Update the hash file

Toolchain datasheet:
  https://sourcery.mentor.com/GNUToolchain/release2935?@template=datasheet



Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>