kernel: Optimize console & logging

* Modified draw loops to use `fbdev_get_index()` less often.
* Created `cons_fast_putch()`, then used it to implement `cons_putch()`
  and `cons_putstr()`. This way, when printing an entire string, the
  lock acquire/release and cursor hide/show will only happen once,
  instead of once per character.
* Modified `syslog_write()` to use `cons_putstr()`.

Signed-off-by: Quinn Stephens <quinn@osmora.org>
Signed-off-by: Ian Moffett <ian@osmora.org>

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