KVM: VMX: Remove unnecessary exception trampoline in vmx_vmenter

The exception trampoline in .fixup section is not needed, the exception
handling code can jump directly to the label in the .text section.

Changes since v1:
- Fix commit message.

Cc: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Message-Id: <20200406202108.74300-1-ubizjak@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>