meta-phosphor: IBM-POWER: add MACHINEOVERRIDES

Add machine overrides for IBM processors:

- ibm-power-cpu: for any IBM POWER processor
- ibm-power8-cpu: for IBM POWER8 processors
- ibm-power9-cpu: for IBM POWER9 processors
- ibm-power10-cpu: for IBM POWER10 processors

ibm-power-cpu is used when an override applies to any IBM POWER
processor.  ibm-power<N>-cpu can be used when a specific override exists
for a specific POWER processor generation.

(From meta-phosphor rev: a59b21d85e90ba5ecfc42e22e751c9dfe6aacb0e)

Change-Id: Ie1eebb677204b9314942f414c10e5dc3134397a9
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
diff --git a/meta-phosphor/conf/machine/include/ibm-power-cpu.inc b/meta-phosphor/conf/machine/include/ibm-power-cpu.inc
new file mode 100644
index 0000000..1ff6dd3
--- /dev/null
+++ b/meta-phosphor/conf/machine/include/ibm-power-cpu.inc
@@ -0,0 +1 @@
+MACHINEOVERRIDES =. "ibm-power-cpu:"
diff --git a/meta-phosphor/conf/machine/include/ibm-power10-cpu.inc b/meta-phosphor/conf/machine/include/ibm-power10-cpu.inc
new file mode 100644
index 0000000..7d518dd
--- /dev/null
+++ b/meta-phosphor/conf/machine/include/ibm-power10-cpu.inc
@@ -0,0 +1,2 @@
+MACHINEOVERRIDES =. "ibm-power10-cpu:"
+require conf/machine/include/ibm-power-cpu.inc
diff --git a/meta-phosphor/conf/machine/include/ibm-power8-cpu.inc b/meta-phosphor/conf/machine/include/ibm-power8-cpu.inc
new file mode 100644
index 0000000..8be9d53
--- /dev/null
+++ b/meta-phosphor/conf/machine/include/ibm-power8-cpu.inc
@@ -0,0 +1,2 @@
+MACHINEOVERRIDES =. "ibm-power8-cpu:"
+require conf/machine/include/ibm-power-cpu.inc
diff --git a/meta-phosphor/conf/machine/include/ibm-power9-cpu.inc b/meta-phosphor/conf/machine/include/ibm-power9-cpu.inc
new file mode 100644
index 0000000..d92cbdf
--- /dev/null
+++ b/meta-phosphor/conf/machine/include/ibm-power9-cpu.inc
@@ -0,0 +1,2 @@
+MACHINEOVERRIDES =. "ibm-power9-cpu:"
+require conf/machine/include/ibm-power-cpu.inc