MdePkg/AcpiXX.h: Update Error Severity type for Generic Error Status Block

MdePkg/AcpiXX.h: Update Error Severity type for Generic Error Status Block

Starting from ACPI Specification Version 5.1 Errata B, the term
'Correctable' is no longer being used as an error severity of the
reported error in Chapter 18 APEI.

This commit will
a) For Acpi40.h & Acpi50.h
Add new macro EFI_ACPI_X_X_ERROR_SEVERITY_RECOVERABLE, since both the
terms 'Correctable' and 'Recoverable' are used to denote the same error
severity.

b) Header files starting from Acpi51.h to Acpi64.h
Add new macro EFI_ACPI_X_X_ERROR_SEVERITY_RECOVERABLE.
Keeps the origin EFI_ACPI_X_X_ERROR_SEVERITY_CORRECTABLE for compatibility
consideration, but add comments to mark it as deprecated and should no
longer be used.

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Signed-off-by: Hao A Wu <hao.a.wu@intel.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>