jenkins/build-seed: Replace rainier with p10bmc
jenkins/build-seed: Replace rainier with p10bmc

The rainier machine target has been replaced with p10bmc.

Change-Id: I1f3cd07250f9ca3f13fe1c1e4f23118d9f989a0b
Signed-off-by: Adriana Kobylak <742cf4d8dead98b4cab50b088fd2a1406293c958@us.ibm.com>

openbmc/openbmc-build-scripts,openbmc/openbmc-build-scripts