xen: using EXPORT_SYMBOL requires including export.h

Fix these warnings:

drivers/xen/biomerge.c:14:1: warning: data definition has no type or storage class [enabled by default]
drivers/xen/biomerge.c:14:1: warning: type defaults to 'int' in declaration of 'EXPORT_SYMBOL' [-Wimplicit-int]
drivers/xen/biomerge.c:14:1: warning: parameter names (without types) in function declaration [enabled by default]

And this build error:

ERROR: "xen_biovec_phys_mergeable" [drivers/block/nvme.ko] undefined!

Signed-off-by: Stephen Rothwell <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/xen/biomerge.c

···
 #include <linux/bio.h>
 #include <linux/io.h>
+#include <linux/export.h>
 #include <xen/page.h>
 
 bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,