backlight: fix typo in tosa_lcd.c

Fix typo in drivers/video/backlight/tosa_lcd.c
"tosa_lcd_reume" should be "tosa_lcd_resume".

Signed-off-by: Masanari Iida <standby24x7@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>