the tacked on @TARGET_bcm53xx causes warnings:
tmp/.config-package.in:14027:warning: ignoring unsupported character '@'
tmp/.config-package.in:26028:warning: ignoring unsupported character '@'
this was wrong.
Fixes: be1761fa1488 ("nu801: add MR26 to the table")
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>