[LinuxBIOS] r2316 broke rumba

[Richard Smith]

linuxbios_ram.o: In function `enable_dev':
northbridge.c:(.text+0x5d45): undefined reference to `graphics_init'
collect2: ld returned 1 exit status
make[1]: *** [linuxbios_ram] Error 1
make[1]: Leaving directory
`/home/rsmith/projects/LinuxBIOSv2/targets/amd/rumba/rumba/normal'

I thought we had abuild setup on linuxbios.org to run a nightly build
check to catch these.