lint/checkpatch.pl: Remove check for keyword 'boolean' in Kconfig

We can not use 'boolean' since commit 53ea1d44 "util/kconfig: Uprev to Linux 5.13's kconfig".
This also reduce difference with upstream.

Change-Id: Iff9fbde46784547c07726816d2fdd71967e0595e
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71940
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
Reviewed-by: Maximilian Brune <maximilian.brune@9elements.com>
Reviewed-by: Felix Singer <felixsinger@posteo.net>

0 files changed, 0 insertions, 0 deletions