[MIPS] Replace __attribute_used__ with __used

Replaces the deprecated __attribute_used__ with __used.  Also makes some
style adjustments to abide by the kernel coding conventions.

Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/kernel/rtlx.c b/arch/mips/kernel/rtlx.c
index bfc8ca1..8cf24d7 100644
--- a/arch/mips/kernel/rtlx.c
+++ b/arch/mips/kernel/rtlx.c
@@ -85,7 +85,7 @@
 	return IRQ_HANDLED;
 }
 
-static __attribute_used__ void dump_rtlx(void)
+static void __used dump_rtlx(void)
 {
 	int i;