Update EFI_DRIVER_HEALTH_HII_MESSAGE definition from UEFI 2.4 specification to replace Reserved with MessageCode.
Update EFI_DRIVER_HEALTH_HII_MESSAGE definition from UEFI 2.4 specification to replace Reserved with MessageCode.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Samer El-Haj-Mahmoud elhaj@hp.com 
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>

git-svn-id: 3158a46dfd52e07d1fda3e32e1ab2e353a00b20f@15894 6f19259b-4bc3-4df7-8a09-765794883524

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