Updated `README.md` with instructions for building/using the kernel module.

[xeon-phi-kernel-module] / ras / Kbuild

obj-m := micras.o

micras-y := micras_main.o micras_common.o
micras-y += micras_core.o micras_uncore.o micras_elog.o
micras-$(CONFIG_ML1OM) += micras_knf.o
micras-$(CONFIG_MK1OM) += micras_knc.o micras_pm.o