x86: acpi: Add SPCR table description
Add SPCR table description as it provided in Linux kernel. Port subtype for ACPI_DBG2_SERIAL_PORT is used as an interface type in SPCR. Thus, provide a set of definitions to be utilized later. Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: NBin Meng <bmeng.cn@gmail.com>
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