Add power cap boundary validation

Limit the power cap boundaries based on values from the MRW.
Use OPEN_POWER_N_PLUS_ONE_BULK_POWER_LIMIT_WATTS and
OPEN_POWER_SOFT_MIN_PCAP_WATTS from the MRW for the boundaries.

Resolves openbmc/openbmc#1863

Change-Id: I16ff55dc8dab8a0f8b837e815e9e409ad23db644
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/meta-witherspoon/recipes-phosphor/settings/phosphor-settings-read-settings-mrw.bbappend b/meta-witherspoon/recipes-phosphor/settings/phosphor-settings-read-settings-mrw.bbappend
new file mode 100644
index 0000000..72d991c
--- /dev/null
+++ b/meta-witherspoon/recipes-phosphor/settings/phosphor-settings-read-settings-mrw.bbappend
@@ -0,0 +1 @@
+FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"