Some cleanup of the console code

[Marin Ramesa]

What follows is a small cleanup of the console code.

[PATCH 1/5] drop unused CONSMAJOR
[PATCH 2/5] track the console buffer usage with a boolean instead of an int
[PATCH 3/5] track the console init with a boolean instead of an int
[PATCH 4/5] qualify constant with the const
[PATCH 5/5] remove hyp_console_write() call