sw64: fix assembly style

Sunway inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5XTGY

--------------------------------
Signed-off-by: NMao Minkai <maominkai@wxiat.com>
Reviewed-by: NHe Sheng <hesheng@wxiat.com>
Signed-off-by: NGu Zitao <guzitao@wxiat.com>

arch/sw_64/kernel/entry-ftrace.S

@@ -79,7 +79,7 @@ ftrace_graph_call:				/* ftrace_graph_caller(); */
 						/* "br ftrace_graph_caller" */
 #endif
 	mcount_end
-	ret $31, ($28), 1
+	ret	$31, ($28), 1
 	.end ftrace_caller
 #else /* !CONFIG_DYNAMIC_FTRACE */
 

arch/sw_64/kernel/entry.S

@@ -403,7 +403,7 @@ __switch_to:
 	stl	$15, TASK_THREAD_S6($16)
 	/* Restore context from next->thread */
 	ldl	$26, TASK_THREAD_RA($17)
-	ldl     $30, TASK_THREAD_SP($17)
+	ldl	$30, TASK_THREAD_SP($17)
 	ldl	$9, TASK_THREAD_S0($17)
 	ldl	$10, TASK_THREAD_S1($17)
 	ldl	$11, TASK_THREAD_S2($17)