MFC r314328:

MFC r314328:

Fix startup race initialising ACPI CM battery structures on MacBookPro.

During acpi_cmbat_attach() the acpi_cmbat_init_battery() notification
handler is registered. It has been observed this notification handler
can be called instantly, before the attach routine has returned. In
the notification handler there is a call to device_is_attached() which
returns false. Because the softc is set we know an attach is in
progress and the fix is simply to wait and try again in this case.

Reviewed by:		avg @

git-svn-id: svn://svn.freebsd.org/base/stable/9@315265 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f