usb: typec: altmodes/displayport: create sysfs nodes as driver's default device attribute group

In the Linux kernel, the following vulnerability has been resolved:

usb: typec: altmodes/displayport: create sysfs nodes as driver's default device attribute group

The DisplayPort driver's sysfs nodes may be present to the userspace before

typec_altmode_set_drvdata() completes in dp_altmode_probe. This means that

a sysfs read can trigger a NULL pointer error by deferencing dp->hpd in

hpd_show or dp->lock in pin_assignment_show, as dev_get_drvdata() returns

NULL in those cases.

Remove manual sysfs node creation in favor of adding attribute group as

default for devices bound to the driver. The ATTRIBUTE_GROUPS() macro is

not used here otherwise the path to the sysfs nodes is no longer compliant

with the ABI.