Fix:
mip405.c: In function 'init_sdram':
mip405.c:250:4: warning: variable 'tctp_clocks' set but not used [-Wunused-but-set-variable]
mip405.c: In function 'initdram':
mip405.c:629:9: warning: variable 'ds' set but not used [-Wunused-but-set-variable]

Signed-off-by: Stefan Roese <sr@denx.de>