sh: Define _ebss for uClinux MTD map driver.

The uClinux MTD device uses _ebss, add the symbol and corresponding
export.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/kernel/vmlinux.lds.S b/arch/sh/kernel/vmlinux.lds.S
index 9cb95af..84a203b 100644
--- a/arch/sh/kernel/vmlinux.lds.S
+++ b/arch/sh/kernel/vmlinux.lds.S
@@ -107,6 +107,7 @@
   	*(.bss.page_aligned)
   	*(.bss)
 	. = ALIGN(4);
+	_ebss = .;			/* uClinux MTD sucks */
 	_end = . ;
   }