iASL: Ensure va_end is always called before function return.

The ISO 9899:1990 7.8.1.3 specification states that undefined
behaviour may occur if va_end is not invoked before return.
Colin King <colin.king@canonical.com>.
Disassembler: Add some missing types for HEST and EINJ tables.

Add a missing EINJ action, and two missing HEST notify names.
Colin King <colin.king@canonical.com>.