rom.sh: remove another TODO

this one is unnecessary, because we're not taking general input
from the user. we mitigate this carefully by being, you know,
careful.

implementing the TODO would have bloated the code, in ways that
might only introduce other serious bugs.

the current logic is fine, and great care will always be taken
by me to keep the code safe, while i'm in charge.

Signed-off-by: Leah Rowe <leah@libreboot.org>

include/rom.sh

@@ -234,8 +234,6 @@ mkcorebootbin_real()
 
 add_cbfs_option()
 {
-	# TODO: input sanitization (currently mitigated by careful config)
-
 	op_name="`printf "%s\n" "$1" | awk '{print $1}'`"
 	op_arg="`printf "%s\n" "$1" | awk '{print $2}'`"