parisc: Add export.h to files needing EXPORT_SYMBOL/THIS_MODULE

These guys were getting it implicitly via module.h before,
when module.h was everywhere.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
diff --git a/arch/parisc/lib/iomap.c b/arch/parisc/lib/iomap.c
index 5069e8b..8f470c9 100644
--- a/arch/parisc/lib/iomap.c
+++ b/arch/parisc/lib/iomap.c
@@ -5,6 +5,7 @@
 
 #include <linux/ioport.h>
 #include <linux/pci.h>
+#include <linux/export.h>
 #include <asm/io.h>
 
 /*