sparc: add export.h to arch/sparc files as required

These files are only exporting symbols, so they don't need
the full module.h header file.  Previously they were getting
access to EXPORT_SYMBOL implicitly via overuse of module.h
from within other .h files, but that is being cleaned up.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
diff --git a/arch/sparc/kernel/leon_pci.c b/arch/sparc/kernel/leon_pci.c
index a8a9a27..f1cf6ef 100644
--- a/arch/sparc/kernel/leon_pci.c
+++ b/arch/sparc/kernel/leon_pci.c
@@ -9,6 +9,7 @@
 #include <linux/of_device.h>
 #include <linux/kernel.h>
 #include <linux/pci.h>
+#include <linux/export.h>
 #include <asm/leon.h>
 #include <asm/leon_pci.h>