kbd_kern.h fixes

[James S. <jsi...@in...>]

Presently the kbd_inline functions pass in a pointer for struct 
kbd_struct. Then the inlines are called as follows:

get_kbd_mode(&vc->kbd_table,..

I purpose that we go back 

get_kbd_mode(vc->kbd_table,...

and the inline functions don't pass in a pointer anymore. Since it is a 
inline function we don't have the cost of a stack push and pop.