EmulatorPkg: Fix typos in comments and variables

EmulatorPkg: Fix typos in comments and variables

- Predfined -> Predefined
- minimue -> minimum
- predeined -> predefined
- excute -> execute
- availible -> available
- discontiguous -> discontinuous
- permenent -> permanent
- immediatly -> immediately
- environmemt -> environment
- Seperator -> Separator
- remmeber -> remember
- initailized -> initialized

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Gary Lin <glin@suse.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>