video: fbdev: acornfb: Mark expected switch fall-through

video: fbdev: acornfb: Mark expected switch fall-through

Mark switch cases where we are expecting to fall through.

Fix the following warning (Building: rpc_defconfig arm):

drivers/video/fbdev/acornfb.c: In function ‘acornfb_parse_dram’:
drivers/video/fbdev/acornfb.c:860:9: warning: this statement may fall through [-Wimplicit-fallthrough=]
    size *= 1024;
    ~~~~~^~~~~~~
drivers/video/fbdev/acornfb.c:861:3: note: here
   case 'K':
   ^~~~

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>