x86/kvm: Make kvm_async_pf_task_wake() a local static helper

Make kvm_async_pf_task_wake() static and drop its export, as the symbol is
only referenced from within kvm.c.

No functional change intended.

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Sean Christopherson <[e-mail]>

arch/x86/include/asm/kvm_para.h

···
 unsigned int kvm_arch_para_features(void);
 unsigned int kvm_arch_para_hints(void);
 void kvm_async_pf_task_wait_schedule(u32 token);
-void kvm_async_pf_task_wake(u32 token);
 u32 kvm_read_and_reset_apf_flags(void);
 bool __kvm_handle_async_pf(struct pt_regs *regs, u32 token);
 
···
 
 #else /* CONFIG_KVM_GUEST */
 #define kvm_async_pf_task_wait_schedule(T) do {} while(0)
-#define kvm_async_pf_task_wake(T) do {} while(0)
 
 static inline bool kvm_para_available(void)
 {

arch/x86/kernel/kvm.c

···
 	}
 }
 
-void kvm_async_pf_task_wake(u32 token)
+static void kvm_async_pf_task_wake(u32 token)
 {
 	u32 key = hash_32(token, KVM_TASK_SLEEP_HASHBITS);
 	struct kvm_task_sleep_head *b = &async_pf_sleepers[key];
···
 	/* A dummy token might be allocated and ultimately not used.  */
 	kfree(dummy);
 }
-EXPORT_SYMBOL_GPL(kvm_async_pf_task_wake);
 
 noinstr u32 kvm_read_and_reset_apf_flags(void)
 {