version: Separate our version string from the version command

In order to be able to disable all commands we need to construct our
version string in a common file, and have the version command reference
that string, like the other users of it do.  Create common/version.c
with just the strings.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/common/version.c b/common/version.c
new file mode 100644
index 0000000..6e27bb8
--- /dev/null
+++ b/common/version.c
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2000-2009
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ */
+
+#include <timestamp.h>
+#include <version.h>
+#include <version_string.h>
+
+#define U_BOOT_VERSION_STRING U_BOOT_VERSION " (" U_BOOT_DATE " - " \
+	U_BOOT_TIME " " U_BOOT_TZ ")" CONFIG_IDENT_STRING
+
+const char version_string[] = U_BOOT_VERSION_STRING;
+const unsigned short version_num = U_BOOT_VERSION_NUM;
+const unsigned char version_num_patch = U_BOOT_VERSION_NUM_PATCH;