dell3050micro: make GRUB the primary payload

SeaBIOS is known to hang on this board. It is being investigated.

Add two variable options for target.cfg files:

* seabiosname
* grubname

This string defines where it would be located in CBFS.

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

script/trees

@@ -12,7 +12,8 @@ set -u -e
 eval `setvars "" xarch srcdir premake cmakedir xlang mode makeargs elfdir cmd \
     project target target_dir targets xtree _f release bootstrapargs mkhelper \
     autoconfargs listfile autogenargs btype tree rev tree_depend build_depend \
-    defconfig postmake mkhelpercfg dry dest_dir mdir cleanargs`; badhash="n"
+    defconfig postmake mkhelpercfg dry dest_dir mdir cleanargs seabiosname \
+    grubname`; badhash="n"
 
 main()
 {
@@ -112,7 +113,7 @@ configure_project()
 {
 	eval `setvars "" xarch xlang build_depend autoconfargs xtree postmake \
 	    tree_depend makeargs btype mkhelper bootstrapargs premake release \
-	    cleanargs`
+	    cleanargs grubname seabiosname`
 	_tcfg="$1/target.cfg"; badhash="n"; [ -f "$_tcfg" ] || btype="auto"
 	[ -f "$datadir/mkhelper.cfg" ] && eval `setcfg "$datadir/mkhelper.cfg"`