[coreboot] addition to getpir

[mbertens]

hi all,

i make an addition to getpir,

getpir works are before without any commandline parameters.
when applying for example build\coreboot_ram as parameter
it looks in the file for the PIRQ table prints it to stdout 
and shows if the checksum is correct.

THis is very handy for developing a PIRQ table.

Marc

PS this patch was send before, but was not applied to svn.