ACPICA: iASL: NHLT: Fix parsing undocumented bytes at the end of Endpoint Descriptor

ACPICA commit 961221a76814ffa0ecc92219ddf857579b0f7d54

Undocumented bytes at the end of Endpoint Descriptor can be present
independently of Linux-specific structures. Their size can also vary.

Link: https://github.com/acpica/acpica/commit/961221a7


Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>