initramfs-framework: Don't use 'tr'

tr is available in busybox, but not in toybox. Just use sed instead.

(From OE-Core rev: 518cca6711f737f44ff74a5ac1308de8c9b49e78)

Signed-off-by: Andrew Bresticker <abrestic@waymo.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/initrdscripts/initramfs-framework/init

@@ -84,7 +84,7 @@ mount -t sysfs sysfs /sys
 # populate bootparam environment
 for p in `cat /proc/cmdline`; do
 	opt=`echo $p | cut -d'=' -f1`
-	opt=`echo $opt | tr '.-' '__'`
+	opt=`echo $opt | sed -e 'y/.-/__/'`
 	if [ "`echo $p | cut -d'=' -f1`" = "$p" ]; then
 		eval "bootparam_${opt}=true"
 	else