MedPkg: Fix EFI_ERROR_SECTION_DESCRIPTOR definition in CPER to match UEFI 2.3.1 specification.

Signed-off-by: Samer El-Haj-Mahmoud elhaj@hp.com
Reviewed-by: Jeff Fan <jeff.fan@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14213 6f19259b-4bc3-4df7-8a09-765794883524