board/ids8247/ids8247.c: Fix GCC 4.6 build warning

Fix:
ids8247.c: In function 'initdram':
ids8247.c:284:14: warning: variable 'lsize' set but not used
[-Wunused-but-set-variable]

Signed-off-by: Wolfgang Denk <wd@denx.de>
Cc: Heiko Schocher <hs@denx.de>