SecurityPkg: Fix typos in comments

This patch fixes the following typos:
- intialized -> initialized
- TURE -> TRUE
- successull -> successfully
- hanlder -> handler
- funciton -> function
- Seperator -> Separator
- Sumbit -> Submit
Also convert EFI_D_ERROR to DEBUG_ERROR for some debug messages.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Gary Lin <glin@suse.com>
Reviewed-by: Chao Zhang <chao.b.zhang@intel.com>

SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.c

@@ -2073,7 +2073,7 @@ OnReadyToBoot (
     for (PcrIndex = 0; PcrIndex < 7; PcrIndex++) {
       Status = MeasureSeparatorEvent (PcrIndex);
       if (EFI_ERROR (Status)) {
-        DEBUG ((EFI_D_ERROR, "Seperator Event not Measured. Error!\n"));
+        DEBUG ((DEBUG_ERROR, "Separator Event not Measured. Error!\n"));
       }
     }