Garbage characters instead of prompt on beaglebone

[Lwazi Dube <lwazeh%gmail.com@localhost>]

Hi,

I see garbage characters instead of a prompt on beaglebone (white)
after this commit.

commit 2b9bd6fcfd390f7e97c22b561d973003d37a44f3
Author: thorpej <thorpej%netbsd.org@localhost>
Date:   Sat Dec 8 21:14:37 2018 +0000

    Remove the COM_REGMAP option -- just use it all the time.  While here,
    garbage-collect the COM_FUNCMAP and COM_AU1X00 options, as there are
    not used anywhere.
------------
BEFORE:

[   9.4244983] kern.module.path=/stand/evbarm/8.99.27/modules
[   9.4244983] WARNING: no TOD clock present
[   9.4340047] WARNING: using filesystem time
[   9.4381077] WARNING: CHECK AND RESET THE DATE!
[   9.4426188] init path (default /sbin/init):
[  10.4332433] init: copying out path `/sbin/init' 11
/etc/rc.conf is not configured.  Multiuser boot aborted.
Enter pathname of shell or RETURN for /bin/sh:
We recommend that you create a non-root account and use su(1) for root access.
#

AFTER:
[   9.8133793] kern.module.path=/stand/evbarm/8.99.27/modules
[   9.8133793] WARNING: no TOD clock present
[   9.8229186] WARNING: using filesystem time
[   9.8270118] WARNING: CHECK AND RESET THE DATE!
[   9.8326220] init path (default /sbin/init):
[   9.8370086] init: copying out path `/sbin/init' 11
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