base-files: mount pstore if present

Pstore (persistent store) can be used to stash debug information (kernel
console, panics, ftrace) across reboots or crashes. If the filesystem is
present, mount it.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>

package/base-files/files/etc/init.d/boot

@@ -35,6 +35,7 @@ boot() {
 	ln -sf /tmp/resolv.conf.d/resolv.conf.auto /tmp/resolv.conf
 	grep -q debugfs /proc/filesystems && /bin/mount -o noatime -t debugfs debugfs /sys/kernel/debug
 	grep -q bpf /proc/filesystems && /bin/mount -o nosuid,nodev,noexec,noatime,mode=0700 -t bpf bpffs /sys/fs/bpf
+	grep -q pstore /proc/filesystems && /bin/mount -o noatime -t pstore pstore /sys/fs/pstore
 	[ "$FAILSAFE" = "true" ] && touch /tmp/.failsafe
 
 	/sbin/kmodloader