Get rid of all unused CIU macros and sort them. Verified with
'make allyesconfig' build test.

[paul.burton@mips.com:
  - Also checked via convoluted grep invocation for use of all removed
    macros within arch/mips/ & drivers/.]
Signed-off-by: NSteven J. Hill <steven.hill@cavium.com>
Signed-off-by: NPaul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/19710/
Cc: linux-mips@linux-mips.org
Cc: Chandrakala Chavva <cchavva@caviumnetworks.com>