encrypted-storage: use luks as the feature name for current implementation

encrypted-storage layer will include more security features about encrypted
storage so the term "encrypted-storage" won't be used to specify a dedicated
technology term such as "LUKS".

Signed-off-by: Jia Zhang <lans.zhang2008@gmail.com>

meta-encrypted-storage/recipes-kernel/linux/linux-yocto-luks.inc

@@ -1,6 +1,6 @@
 FILESEXTRAPATHS_prepend := "${THISDIR}/linux-yocto:"
 
 SRC_URI += "\
-    ${@bb.utils.contains('DISTRO_FEATURES', 'encrypted-storage', \
+    ${@bb.utils.contains('DISTRO_FEATURES', 'luks', \
                          'file://dmcrypt.scc file://dmcrypt.cfg', '', d)} \
 "

meta-encrypted-storage/recipes-kernel/linux/linux-yocto-rt_%.bbappend

@@ -1 +1 @@
-include linux-yocto-encrypted-storage.inc
+include linux-yocto-luks.inc

meta-encrypted-storage/recipes-kernel/linux/linux-yocto_%.bbappend

@@ -1 +1 @@
-include linux-yocto-encrypted-storage.inc
+include linux-yocto-luks.inc