HV: instr_emul: Rearrange logic of instr_emul*

Originally, there is cross-references between instr_emul.h and instr_emul_wrapper.h.
User must include both of them when calling instruction emulation functions. This
will raise up some confusion and inconvenience.

So we rearrange the logic of instruction emulation code as following:

  - External API -- defined in instr_emul.h
     * decode_instruction(struct vcpu *vcpu)
     * emulate_instruction(struct vcpu *vcpu)

  - Make all other functions as static in instr_emul.c

  - Remove instr_emul_wrapper.c/h

No functional change.

Signed-off-by: Kaige Fu <kaige.fu@intel.com>
Reviewed-by: Eddie Dong <eddie.dong@intel.com>
Reviewed-by: Yin Fengwei <fengwei.yin@intel.com>

Author: KaigeFu

hypervisor/Makefile

@@ -139,7 +139,6 @@ C_SRCS += arch/x86/pm.c
 S_SRCS += arch/x86/wakeup.S
 C_SRCS += arch/x86/guest/vcpu.c
 C_SRCS += arch/x86/guest/vm.c
-C_SRCS += arch/x86/guest/instr_emul_wrapper.c
 C_SRCS += arch/x86/guest/vlapic.c
 C_SRCS += arch/x86/guest/guest.c
 C_SRCS += arch/x86/guest/vmcall.c

hypervisor/arch/x86/ept.c

@@ -6,7 +6,6 @@
 
 #include <hypervisor.h>
 
-#include "guest/instr_emul_wrapper.h"
 #include "guest/instr_emul.h"
 
 #define ACRN_DBG_EPT	6U