x86: ivybridge: Declare global data where it is used

Some files are missing this declaration. Add it to avoid build errors when
we actually need the declaration.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

arch/x86/cpu/ivybridge/bd82x6x.c

@@ -19,6 +19,8 @@
 #include <asm/arch/pch.h>
 #include <asm/arch/sandybridge.h>
 
+DECLARE_GLOBAL_DATA_PTR;
+
 #define GPIO_BASE	0x48
 #define BIOS_CTRL	0xdc
 

arch/x86/cpu/ivybridge/lpc.c

@@ -20,6 +20,8 @@
 #include <asm/pci.h>
 #include <asm/arch/pch.h>
 
+DECLARE_GLOBAL_DATA_PTR;
+
 #define NMI_OFF				0
 
 #define ENABLE_ACPI_MODE_IN_COREBOOT	0

arch/x86/cpu/ivybridge/model_206ax.c

@@ -22,6 +22,8 @@
 #include <asm/turbo.h>
 #include <asm/arch/model_206ax.h>
 
+DECLARE_GLOBAL_DATA_PTR;
+
 static void enable_vmx(void)
 {
 	struct cpuid_result regs;

arch/x86/cpu/ivybridge/northbridge.c

@@ -19,6 +19,8 @@
 #include <asm/arch/model_206ax.h>
 #include <asm/arch/sandybridge.h>
 
+DECLARE_GLOBAL_DATA_PTR;
+
 int bridge_silicon_revision(struct udevice *dev)
 {
 	struct cpuid_result result;

drivers/video/ivybridge_igd.c

@@ -18,6 +18,8 @@
 #include <asm/arch/pch.h>
 #include <asm/arch/sandybridge.h>
 
+DECLARE_GLOBAL_DATA_PTR;
+
 struct gt_powermeter {
 	u16 reg;
 	u32 value;