wimax: export linux/wimax.h and linux/wimax/i2400m.h with headers_install

These two files are what user space can use to establish communication
with the WiMAX kernel API and to speak the Intel 2400m Wireless WiMAX
connection's control protocol.

Signed-off-by: Inaky Perez-Gonzalez <[e-mail]>
Cc: David Woodhouse <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

include/linux/Kbuild

···
 unifdef-y += xfrm.h
 
 objhdr-y += version.h
+header-y += wimax.h
+header-y += wimax/

include/linux/wimax/Kbuild

···
+header-y += i2400m.h