parisc: Make RO_DATA page aligned in vmlinux.lds.S

The rodata_test program for CONFIG_DEBUG_RODATA_TEST=y complains if
read-only data does not start at page boundary.

Signed-off-by: Helge Deller <deller@gmx.de>

Author: hdeller

arch/parisc/kernel/vmlinux.lds.S

@@ -127,7 +127,7 @@ SECTIONS
 	}
 #endif
 
-	RO_DATA(8)
+	RO_DATA(PAGE_SIZE)
 
 	/* unwind info */
 	. = ALIGN(4);