Add helper functions used for parsing ACPI tables before the ACPICA
subsystem can be brought online. ARM64 needs this primarily for
initializing the SBSA UART via SPCR table, reading ARM boot flags f

Add helper functions used for parsing ACPI tables before the ACPICA
subsystem can be brought online. ARM64 needs this primarily for
initializing the SBSA UART via SPCR table, reading ARM boot flags from the
FADT, counting CPUs, etc.

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