x86/Hyper-V/hv_apic: Include asm/apic.h

Not all configurations magically include asm/apic.h, but the Hyper-V code
requires it. Include it explicitely.

Fixes: 6b48cb5f ("X86/Hyper-V: Enlighten APIC access")
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: Michael Kelley <mikelley@microsoft.com>

arch/x86/hyperv/hv_apic.c

@@ -29,6 +29,7 @@
 #include <linux/cpuhotplug.h>
 #include <asm/hypervisor.h>
 #include <asm/mshyperv.h>
+#include <asm/apic.h>
 
 #ifdef CONFIG_X86_64
 #if IS_ENABLED(CONFIG_HYPERV)