GCC4.6: Squash warning in lcd.c

lcd.c: In function 'lcd_setmem':
lcd.c:446:2: warning: format '%d' expects type 'int', but argument 2 has type
'u_long'
lcd.c:446:2: warning: format '%d' expects type 'int', but argument 3 has type
'u_long'

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Simon Glass <sjg@chromium.org>
Cc: Mike Frysinger <vapier@gentoo.org>