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

MdePkg/BaseCpuLib: 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

v2: Remove CpuSleep.nasm| GCC and CpuFlushTlb.nasm| GCC in X64 arch
    in BaseCpuLib.inf.

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>