Cleanup unused bus_training_rt module

Change-Id: I5c93573e412006ececcf21c204d9845b4492dfc7
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/45238
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Reviewed-by: Brian J. Stegmiller <bjs@us.ibm.com>
Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com>
Reviewed-by: Caleb N. Palmer <cnpalmer@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Zane C. Shelley <zshelle@us.ibm.com>

src/makefile

@@ -287,7 +287,6 @@ RUNTIME_MODULES += scom_rt
 RUNTIME_MODULES += vpd_rt
 RUNTIME_MODULES += i2c_rt
 RUNTIME_MODULES += $(if $(CONFIG_HTMGT),htmgt_rt)
-#RUNTIME_MODULES += $(if $(CONFIG_HBRT_PRD),bus_training_rt)  @RTC 136120 runtime lane repair support
 RUNTIME_MODULES += $(if $(CONFIG_HBRT_PRD),attn_rt)
 RUNTIME_MODULES += $(if $(CONFIG_HBRT_PRD),prdf_rt)
 RUNTIME_MODULES += $(if $(CONFIG_BMC_IPMI),ipmi_rt)