UBUNTU: [Config] CONFIG_RETPOLINE=y

CVE-2017-5715 (Spectre v2 retpoline)
Signed-off-by: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

debian.master/config/config.common.ubuntu

@@ -6316,6 +6316,7 @@ CONFIG_RENESAS_DMA=y
 CONFIG_RENESAS_INTC_IRQPIN=y
 CONFIG_RENESAS_IRQC=y
 CONFIG_RENESAS_USB_DMAC=m
+CONFIG_RETPOLINE=y
 CONFIG_RETU_WATCHDOG=m
 CONFIG_RFD_FTL=m
 CONFIG_RFKILL_GPIO=m