Early cpio decoder and ACPI table override via initrd making use of it

[Thomas Renninger]

Should still apply on latest Linux tree, I can resubmit if not.
Would be great if hpa can push this into a x86 branch to get
this into linux-next and into Linus' tree with the next merge
window.

Thanks,

    Thomas

Dmesg output of a quick test:
 FACP ACPI table found in initrd [kernel/firmware/acpi/facp.aml][0xf4]
 DSDT ACPI table found in initrd [kernel/firmware/acpi/dsdt.aml][0x333c]
 e820: modified physical RAM map:
...
   modified: [mem 0x00000000f7fec000-0x00000000f7fef42f] ACPI data
...
 Disabling lock debugging due to kernel taint
 ACPI: Override [FACP-OEMFACP ], this is unsafe: tainting kernel
 ACPI: FACP 00000000f7ff0281 Physical table override, new table: ffffffffff4b7000
 ACPI: FACP 00000000f7fec000 000F4 (v03 A M I  OEMFACP  08000713 INTL 20120518)
 ACPI: Override [DSDT-0AAAA001], this is unsafe: tainting kernel
 ACPI: DSDT 00000000f7ff0410 Physical table override, new table: ffffffffff4b70f4
 ACPI: DSDT 00000000f7fec0f4 0333C (v01  0AAAA 0AAAA001 00000001 INTL 20120518)


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