Various small tweaks. Compiled and booted.

1. add IORESOURCE_BUSY | IORESOURCE_MEM also for the kernel code and
     data resources. I don't believe this actually matters one bit, but
     they're hooked into a BUSY/MEM parent ("System RAM") and marking
     them busy seems to make sense.

2. delete the .start = 1M default for the kernel code resource. This
     isn't actually a change; it's set to virt_to_phys(_text) in
     setup_arch() overriding any default anyways.

3. s/vram_resource/video_ram_resource/. Lines up much nicer with
     video_rom_resource...

4. s/checksum/romchecksum/. setup.c is a fairly large file, and
     "checksum" pollutes the namespace.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>