base-files: remove /var/cache from volatiles

Having the cache in tmpfs implies cache regeneration after every reboot.
For an embedded device this might not be very efficient. So, it is
better for the cache to be persistent between reboots.

(From OE-Core rev: 7152ba27026265ba108caf4437638093f5897ec8)

Signed-off-by: Laurentiu Palcu <laurentiu.palcu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/base-files/base-files_3.0.14.bb

@@ -42,7 +42,7 @@ dirs755 = "/bin /boot /dev ${sysconfdir} ${sysconfdir}/default \
            ${mandir} ${datadir}/misc ${localstatedir} \
            ${localstatedir}/backups ${localstatedir}/lib \
            /sys ${localstatedir}/lib/misc ${localstatedir}/spool \
-           ${localstatedir}/volatile ${localstatedir}/volatile/cache \
+           ${localstatedir}/volatile \
            ${localstatedir}/volatile/lock/subsys \
            ${localstatedir}/volatile/log \
            ${localstatedir}/volatile/run \
@@ -55,7 +55,7 @@ dirs3755 = "/srv  \
             ${prefix}/local/share ${prefix}/local/src"
 dirs4775 = "/var/mail"
 
-volatiles = "cache run log lock tmp"
+volatiles = "run log lock tmp"
 conffiles = "${sysconfdir}/debian_version ${sysconfdir}/host.conf \
              ${sysconfdir}/inputrc ${sysconfdir}/issue /${sysconfdir}/issue.net \
              ${sysconfdir}/nsswitch.conf ${sysconfdir}/profile \