busybox: default ls color output, less search and truncate

Add features to busybox configuration:
- default color output for ls. ls still disables color for non-tty files
- support for less search (with slash /)
- support for less -S (truncate lines instead of wrapping)

Notably, this makes journalctl --no-pager | less -S much more usable. ls
colors were because I saw petitboot's busybox had them enabled.

Signed-off-by: Xo Wang <xow@google.com>
Change-Id: I11870a26c90d8d38f6d172906f2ea407af45e2c7
diff --git a/common/recipes-core/busybox/busybox/busybox.cfg b/common/recipes-core/busybox/busybox/busybox.cfg
index 174a3f2..9e78838 100644
--- a/common/recipes-core/busybox/busybox/busybox.cfg
+++ b/common/recipes-core/busybox/busybox/busybox.cfg
@@ -1 +1,4 @@
 CONFIG_DEVMEM=y
+CONFIG_FEATURE_LS_COLOR_IS_DEFAULT=y
+CONFIG_FEATURE_LESS_TRUNCATE=y
+CONFIG_FEATURE_LESS_REGEXP=y