busybox: enable the devmem applet

The devmem applet allows poking at HW registers and as such is a
valuable tool to have to avoid recompiling kernels or resorting to
external HW adapters to modify HW behavior.

Signed-off-by: Florian Fainelli <florian@openwrt.org>

SVN-Revision: 39285

package/utils/busybox/config/default

@@ -78,7 +78,7 @@ CONFIG_DEFAULT_SETFONT_DIR=""
 # CONFIG_DEVFSD_FG_NP is not set
 # CONFIG_DEVFSD_MODLOAD is not set
 # CONFIG_DEVFSD_VERBOSE is not set
-# CONFIG_DEVMEM is not set
+CONFIG_DEVMEM=y
 CONFIG_DF=y
 CONFIG_DHCPD_LEASES_FILE=""
 # CONFIG_DHCPRELAY is not set