alpha: Add export.h for THIS_MODULE/EXPORT_SYMBOL

These files were getting it via the implicit module.h
presence that was everywhere.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

arch/alpha/kernel/core_irongate.c

@@ -303,6 +303,7 @@ irongate_init_arch(void)
 #include <linux/vmalloc.h>
 #include <linux/agp_backend.h>
 #include <linux/agpgart.h>
+#include <linux/export.h>
 #include <asm/pgalloc.h>
 
 #define GET_PAGE_DIR_OFF(addr) (addr >> 22)

arch/alpha/kernel/pci_iommu.c

@@ -7,6 +7,7 @@
 #include <linux/pci.h>
 #include <linux/gfp.h>
 #include <linux/bootmem.h>
+#include <linux/export.h>
 #include <linux/scatterlist.h>
 #include <linux/log2.h>
 #include <linux/dma-mapping.h>

arch/alpha/kernel/setup.c

@@ -43,6 +43,7 @@
 #include <asm/setup.h>
 #include <asm/io.h>
 #include <linux/log2.h>
+#include <linux/export.h>
 
 extern struct atomic_notifier_head panic_notifier_list;
 static int alpha_panic_event(struct notifier_block *, unsigned long, void *);