general code cleanup on lbmk shell scripts

in update/blobs/download, i saw instances where
appdir was being deleted with rm -r, but the more
appropriate command would rm -Rf. this is now fixed.

other than that, i've mostly just simplified a bunch
of if statements and consolidated some duplicated
logic (e.g. if/else block for dependencies in
build_dependencies() of update/blobs/download

one or two functions and/or variables have been
renamed, for greater clarity in the code, also
removed a few messages that were redundant

used printf instead of echo, in a few places, also
fixed up the indentation in a few places

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

resources/scripts/build/coreboot/utils

@@ -39,10 +39,8 @@ main()
 
 build_for_mainboard() {
 	board="${1}"
-	[ ! -d "resources/coreboot/${board}" ] && \
-		continue
-	[ ! -f "resources/coreboot/${board}/target.cfg" ] && \
-		continue
+	[ -d "resources/coreboot/${board}" ] || continue
+	[ -f "resources/coreboot/${board}/target.cfg" ] || continue
 	tree="undefined"
 	. "resources/coreboot/${board}/target.cfg" # source
 	if [ "${tree}" = "undefined" ]; then
@@ -55,15 +53,12 @@ build_for_mainboard() {
 
 buildutils() {
 	tree="${1}"
-	if [ ! -d "coreboot/${tree}/" ]; then
+	[ -d "coreboot/${tree}/" ] || \
 		./fetch_trees coreboot $tree || return 1
-	fi
 	for util in cbfstool ifdtool; do
-		[ -f "cbutils/${tree}/${util}" ] \
-			&& continue
-		if [ ! -d "cbutils/${tree}" ]; then
+		[ -f "cbutils/${tree}/${util}" ] && continue
+		[ -d "cbutils/${tree}" ] || \
 			mkdir -p "cbutils/${tree}" || return 1
-		fi
 
 		utildir="coreboot/${tree}/util/${util}"
 		make distclean -C "${utildir}" || return 1