x86/paravirt: Remove const mark from x86_hyper_xen_hvm variable

.. as "nopv" support needs it to be changeable at boot up stage.

Checkpatch reports warning, so move variable declarations from
hypervisor.c to hypervisor.h

Signed-off-by: Zhenzhong Duan <[e-mail]>
Reviewed-by: Juergen Gross <[e-mail]>
Cc: Boris Ostrovsky <[e-mail]>
Cc: Juergen Gross <[e-mail]>
Cc: Stefano Stabellini <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Borislav Petkov <[e-mail]>
Signed-off-by: Juergen Gross <[e-mail]>

arch/x86/include/asm/hypervisor.h

···
 	bool ignore_nopv;
 };
 
+extern const struct hypervisor_x86 x86_hyper_vmware;
+extern const struct hypervisor_x86 x86_hyper_ms_hyperv;
+extern const struct hypervisor_x86 x86_hyper_xen_pv;
+extern const struct hypervisor_x86 x86_hyper_kvm;
+extern const struct hypervisor_x86 x86_hyper_jailhouse;
+extern const struct hypervisor_x86 x86_hyper_acrn;
+extern struct hypervisor_x86 x86_hyper_xen_hvm;
+
 extern bool nopv;
 extern enum x86_hypervisor_type x86_hyper_type;
 extern void init_hypervisor_platform(void);

arch/x86/kernel/cpu/hypervisor.c

···
 #include <asm/processor.h>
 #include <asm/hypervisor.h>
 
-extern const struct hypervisor_x86 x86_hyper_vmware;
-extern const struct hypervisor_x86 x86_hyper_ms_hyperv;
-extern const struct hypervisor_x86 x86_hyper_xen_pv;
-extern const struct hypervisor_x86 x86_hyper_xen_hvm;
-extern const struct hypervisor_x86 x86_hyper_kvm;
-extern const struct hypervisor_x86 x86_hyper_jailhouse;
-extern const struct hypervisor_x86 x86_hyper_acrn;
-
 static const __initconst struct hypervisor_x86 * const hypervisors[] =
 {
 #ifdef CONFIG_XEN_PV

arch/x86/xen/enlighten_hvm.c

···
 #endif
 }
 
-const __initconst struct hypervisor_x86 x86_hyper_xen_hvm = {
+struct hypervisor_x86 x86_hyper_xen_hvm __initdata = {
 	.name                   = "Xen HVM",
 	.detect                 = xen_platform_hvm,
 	.type			= X86_HYPER_XEN_HVM,