common.h: re-order includes

the new order more reliably indicates which order
everything is executed in, by virtue of the functions
provided in each file.

Signed-off-by: Leah Rowe <leah@libreboot.org>

include/common.sh

@@ -2,12 +2,16 @@
 
 . "include/lib.sh"
 . "include/env/init.sh"
+. "include/env/get.sh"
+
 . "include/fw/vendor.sh"
 . "include/fw/mrc.sh"
 . "include/fw/inject.sh"
 . "include/fw/rom.sh"
+
 . "include/mk/release.sh"
-. "include/env/get.sh"
+
+# tree.sh is included from the main mk script
 
 xbcommands=" \
 version \