Information provided to the GRADD in the GHI_CMD_INIT function.
typedef struct _GDDINITIN {
ULONG ulLength; /* Length of the GDDINITIN data structure, in bytes. */
PFNHWENTRY pfnChainedHWEntry; /* Entry of previous GRADD in chain. */
} GDDINITIN;
typedef GDDINITIN *PGDDINITIN;