sysfs: add a linecompat span attribute

This way, dahdi_genconf may gather needed information without issuing
ioctl()'s

Signed-off-by: Shaun Ruffell <sruffell@digium.com>
Acked-by: Tzafrir Cohen <tzafrir.cohen@xorcom.com>

git-svn-id: http://svn.asterisk.org/svn/dahdi/linux/trunk@10684 a0bf4364-ded3-4de4-8d8a-66a801d63aff

include/dahdi/kernel.h

@@ -806,6 +806,7 @@ enum spantypes {
 };
 const char *dahdi_spantype2str(enum spantypes st);
 enum spantypes dahdi_str2spantype(const char *name);
+const char *dahdi_lineconfig_bit_name(int lineconfig_bit);
 
 struct file;