MdePkg/BaseMemoryLibMmx: Remove .S files for IA32 and X64 arch

.nasm file has been added for X86 arch. .S assembly code
is not required any more.
https://bugzilla.tianocore.org/show_bug.cgi?id=1594

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Shenglei Zhang <shenglei.zhang@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

MdePkg/Library/BaseMemoryLibMmx/BaseMemoryLibMmx.inf

@@ -52,27 +52,16 @@
 
 [Sources.Ia32]
   Ia32/ScanMem64.nasm
-  Ia32/ScanMem64.S
   Ia32/ScanMem32.nasm
-  Ia32/ScanMem32.S
   Ia32/ScanMem16.nasm
-  Ia32/ScanMem16.S
   Ia32/ScanMem8.nasm
-  Ia32/ScanMem8.S
   Ia32/CompareMem.nasm
-  Ia32/CompareMem.S
   Ia32/SetMem64.nasm
-  Ia32/SetMem64.S
   Ia32/SetMem32.nasm
-  Ia32/SetMem32.S
   Ia32/SetMem16.nasm
-  Ia32/SetMem16.S
   Ia32/ZeroMem.nasm
-  Ia32/ZeroMem.S
   Ia32/SetMem.nasm
-  Ia32/SetMem.S
   Ia32/CopyMem.nasm
-  Ia32/CopyMem.S
   Ia32/ScanMem64.nasm
   Ia32/ScanMem32.nasm
   Ia32/ScanMem16.nasm
@@ -99,27 +88,16 @@
   X64/SetMem.nasm
   X64/CopyMem.nasm
   X64/ScanMem64.nasm
-  X64/ScanMem64.S
   X64/ScanMem32.nasm
-  X64/ScanMem32.S
   X64/ScanMem16.nasm
-  X64/ScanMem16.S
   X64/ScanMem8.nasm
-  X64/ScanMem8.S
   X64/CompareMem.nasm
-  X64/CompareMem.S
   X64/SetMem64.nasm
-  X64/SetMem64.S
   X64/SetMem32.nasm
-  X64/SetMem32.S
   X64/SetMem16.nasm
-  X64/SetMem16.S
   X64/ZeroMem.nasm
-  X64/ZeroMem.S
   X64/SetMem.nasm
-  X64/SetMem.S
   X64/CopyMem.nasm
-  X64/CopyMem.S
   X64/IsZeroBuffer.nasm