config: add new everest machine support

The upcoming IBM everest system will be supported within the "rainier"
flash image.

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: I3f074fd1d8700ad921c6384e849e72e22ed29aff
diff --git a/item_updater_main.cpp b/item_updater_main.cpp
index 31a58bd..7249f52 100644
--- a/item_updater_main.cpp
+++ b/item_updater_main.cpp
@@ -71,6 +71,7 @@
             ->callback([&bus, &loop, &subcommandContext]() {
                 using namespace std::string_literals;
                 std::map<std::string, std::vector<std::string>> extensionMap{{
+                    {"ibm,everest"s, {".EVEREST_XML"s, ".P10"s}},
                     {"ibm,rainier-2u"s, {".RAINIER_2U_XML"s, ".P10"s}},
                     {"ibm,rainier-4u"s, {".RAINIER_4U_XML"s, ".P10"s}},
                 }};