arm64: defconfig: Enable PL031

Since Real Time Clock (RTC) configuration options were first enabled in the arm64 defconfig (commit 2d39ad6 "arm64: defconfig: update defconfig for 3.18"), QEMU's device tree based virt machine has grown to include a PL031 RTC. Update the defconfig accordingly.

---
 arch/arm64/configs/defconfig | 1 +
 1 file changed, 1 insertion(+)

index bdd7aa3..9bd25e0 100644
@@ -168,6 +168,7 @@ CONFIG_LEDS_TRIGGER_HEARTBEAT=y
 CONFIG_LEDS_TRIGGER_CPU=y
 CONFIG_RTC_CLASS=y
 CONFIG_RTC_DRV_EFI=y
+CONFIG_RTC_DRV_PL031=y
 CONFIG_RTC_DRV_XGENE=y
 CONFIG_DMADEVICES=y
 CONFIG_QCOM_BAM_DMA=y

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