x86: qemu: enable CONFIG_SPL_DM_RTC

Since commit 380d4f787a3f ("rtc: Allow use of RTC in SPL and TPL")
qemu-x86_64_defconfig does not boot anymore.

Fixes: 380d4f787a3f ("rtc: Allow use of RTC in SPL and TPL")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/configs/qemu-x86_64_defconfig b/configs/qemu-x86_64_defconfig
index cf1ba8e..32922b8 100644
--- a/configs/qemu-x86_64_defconfig
+++ b/configs/qemu-x86_64_defconfig
@@ -63,6 +63,7 @@
 CONFIG_SYSCON=y
 CONFIG_SPL_SYSCON=y
 CONFIG_CPU=y
+CONFIG_SPL_DM_RTC=y
 CONFIG_SPI=y
 CONFIG_SPL_TIMER=y
 CONFIG_USB_STORAGE=y