acpi.h: Small fixes and adding comments.

acpi.h: Small fixes and adding comments.

 - Mention full name of all the tables (SSDT, FADT, etc).

 - Drop obsolete / incorrect "LXBIOS" reference.

 - Add missing ACPI address space type #defines specified in newer versions:
   ACPI_ADDRESS_SPACE_EC, ACPI_ADDRESS_SPACE_SMBUS.

 - Add missing "enum acpi_apic_types" entries: Localx2Apic, Localx2ApicNMI.

 - Add ACPI_FACS_64BIT_WAKE_F #define.

Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Acked-by: Uwe Hermann <uwe@hermann-uwe.de>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@6110 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1