OvmfPkg/IndustryStandard/Q35MchIch9.h: add extended TSEG size macros
OvmfPkg/IndustryStandard/Q35MchIch9.h: add extended TSEG size macros

Add the macros for interfacing with the QEMU feature added in QEMU commit
2f295167e0c4 ("q35/mch: implement extended TSEG sizes", 2017-06-08).

Cc: Jordan Justen <a79006884ba9cf5f4f7fcbb92a15b208780d8c97@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <7437296077edea1cb64451c122c4dac071f0cfbc@redhat.com>
Reviewed-by: Jordan Justen <a79006884ba9cf5f4f7fcbb92a15b208780d8c97@intel.com>

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