openpower: Add loadkeys package to enable backtab

This is a copy of the buildroot package 'kbd', but with a custom install
command that only installs the 'loadkeys' binary, saving almost 1MB of
space.

The loadkeys command then allows us to add additional keymap definitions
during init to enable the use of Shift-Tab on the VGA console.

Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
diff --git a/openpower/package/loadkeys/loadkeys.hash b/openpower/package/loadkeys/loadkeys.hash
new file mode 100644
index 0000000..39a4cdd
--- /dev/null
+++ b/openpower/package/loadkeys/loadkeys.hash
@@ -0,0 +1,2 @@
+# From https://www.kernel.org/pub/linux/utils/kbd/sha256sums.asc
+sha256	7a899de1c0eb75f3aea737095a736f2375e1cbfbe693fc14a3fe0bfb4649fb5e	kbd-2.0.3.tar.xz