meta-facebook: minerva: Enable RTC in the kernel config

Enable RTC PCF8563 which is the new device starting from the EVT board.

Change-Id: Ia92e148db48552966d7f36f7b15c1bb551438356
Signed-off-by: Yang Chen <yang.chen@quantatw.com>
diff --git a/meta-facebook/meta-minerva/recipes-kernel/linux/linux-aspeed/minerva.cfg b/meta-facebook/meta-minerva/recipes-kernel/linux/linux-aspeed/minerva.cfg
index 5f0bfda..7672eb6 100644
--- a/meta-facebook/meta-minerva/recipes-kernel/linux/linux-aspeed/minerva.cfg
+++ b/meta-facebook/meta-minerva/recipes-kernel/linux/linux-aspeed/minerva.cfg
@@ -30,3 +30,6 @@
 
 # SPI GPIO
 CONFIG_SPI_GPIO=y
+
+# RTC
+CONFIG_RTC_DRV_PCF8563=y