macbook21: Kill empty mainboard.asl

Change-Id: I29c7d367df7d1ce911f6cd7ed5e5c56865b41dcc
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/7063
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins)
bd82x6x: Consolidate common GNVS init

Change-Id: Iea035f80695623e4e8d53eea7e3ec294d868fb5b
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/7053
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>