platform/x86: asus-wmi: Simplify some of the *_check_present() helpers

After the recent cleanup patches, some of the *_check_present() helpers
just propagate the result of asus_wmi_dev_is_present().

Replace these with direct asus_wmi_dev_is_present() calls as a further
cleanup.

Cc: Luke D. Jones <luke@ljones.dev>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20220815150538.474306-1-hdegoede@redhat.com