platform/x86: lenovo-yogabook: Set default keyboard backligh brightness on probe()

platform/x86: lenovo-yogabook: Set default keyboard backligh brightness on probe()

[ Upstream commit 9e6380d6573181c555ca1b5019b08d19a9ee581c ]

Set default keyboard backlight brightness on probe(), this fixes
the backlight being off after a rmmod + modprobe.

Fixes: c0549b72d99d ("platform/x86: lenovo-yogabook-wmi: Add driver for Lenovo Yoga Book")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20230430165807.472798-5-hdegoede@redhat.com
Signed-off-by: Sasha Levin <sashal@kernel.org>