[patch x86/hyperv resend] x86, hyperv: Fix build error

[David Rientjes]

9e7827b5ea4c ("x86, hyperv: Get the local APIC timer frequency from the 
hypervisor") breaks the build when CONFIG_SMP is disabled because apic.h 
isn't directly included:

arch/x86/kernel/cpu/mshyperv.c: In function 'ms_hyperv_init_platform':
arch/x86/kernel/cpu/mshyperv.c:90:3: error: 'lapic_timer_frequency' undeclared (first use in this function)
arch/x86/kernel/cpu/mshyperv.c:90:3: note: each undeclared identifier is reported only once for each function it appears in

This happens because mshyperv.c includes linux/desc.h, which includes 
linux/smp.h, which includes asm/smp.h iff CONFIG_SMP is enabled, and 
asm/smp.h is what includes asm/apic.h for CONFIG_X86_LOCAL_APIC.

Fix it by directly including asm/apic.h.

Acked-by: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>
Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
---
 arch/x86/kernel/cpu/mshyperv.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -25,6 +25,7 @@
 #include <asm/idle.h>
 #include <asm/irq_regs.h>
 #include <asm/i8259.h>
+#include <asm/apic.h>
 
 struct ms_hyperv_info ms_hyperv;
 EXPORT_SYMBOL_GPL(ms_hyperv);
--
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