GCC4.6: Squash warnings in lcd.c

GCC4.6: Squash warnings in lcd.c

lcd.c: In function ‘lcd_drawchars’:
lcd.c:214:9: warning: variable ‘off’ set but not used
[-Wunused-but-set-variable]
lcd.c: In function ‘lcd_display_bitmap’:
lcd.c:617:16: warning: variable ‘compression’ set but not used
[-Wunused-but-set-variable]

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
[sw0312.kim: cherry-pick from mainline commit be547c6db32d to fix build warning]
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Change-Id: I09ae696ae78c82a8761b4ef15befa6f55eddbcc4