acpi_create_mcfg_mmconfig: Zero-out the structure before filling.

Otherwise "reserved" fields end up with a garbage instead of predictable
value.

Change-Id: I8a036769a8f86f1d6752651601de2800f4f1bd00
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/7014
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>
bd82x6x, ibexpeak, lynxpoint: Ensure 0-filling of uninited GNVS vars.

Change-Id: I672c3ca9e7f30a21330cf1920a25b1ab38b3f282
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/7015
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>
lynxpoint: Change OEM table ID for serialio.

According to ACPI spec all SSDTs should have distinct OEM table ID.
We end up with 2 SSDTs named "COREBOOT". Fix this.

Change-Id: I01bccb72758baf51c6b4263778716f4bb9d438c9
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/7016
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>