[Patch] avr32: select GENERIC_ATOMIC64

[Cong Wang]

avr32 doesn't implement atomic64_ operations, if not select this,
we would get:

kernel/trace/trace_clock.c:117: error: syntax error before 'trace_counter'
kernel/trace/trace_clock.c:126: error: implicit declaration of function 'atomic64_add_return'

Cc: Haavard Skinnemoen <hskinnemoen@xxxxxxxxx>
Cc: Hans-Christian Egtvedt <egtvedt@xxxxxxxxxxxx>
Signed-off-by: WANG Cong <xiyou.wangcong@xxxxxxxxx>

---
diff --git a/arch/avr32/Kconfig b/arch/avr32/Kconfig
index 197e96f..6ecb8f4 100644
--- a/arch/avr32/Kconfig
+++ b/arch/avr32/Kconfig
@@ -11,6 +11,7 @@ config AVR32
 	select HARDIRQS_SW_RESEND
 	select GENERIC_IRQ_SHOW
 	select ARCH_HAVE_NMI_SAFE_CMPXCHG
+	select GENERIC_ATOMIC64
 	help
 	  AVR32 is a high-performance 32-bit RISC microprocessor core,
 	  designed for cost-sensitive embedded applications, with particular
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