leds-net5501: taints kernel, add license

Add MODULE_LICENSE() that matches file comments so that kernel
is not tainted.

leds_net5501: module license 'unspecified' taints kernel.

Signed-off-by: Randy Dunlap <[e-mail]>
Acked-by: Richard Purdie <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/leds/leds-net5501.c

···
 }
 
 arch_initcall(soekris_init);
+
+MODULE_LICENSE("GPL");