obmc-console: Support 8 slots for Yosemite 4

Support ttyS5~ttyS8 if multi-host is needed.
Support server/client conf 2204~2207 for console redirection.
Support ttyS5~ttyS8 host-logger.

Tested:
- Do obmc-console to link from uart1 to uart9
- List log of lost-logger

Change-Id: I558f71992f2cdab6c2a6338f728cdf5d476bcff2
Signed-off-by: Delphine CC Chiu <Delphine_CC_Chiu@wiwynn.com>
diff --git a/meta-facebook/meta-yosemite4/recipes-kernel/linux/linux-aspeed/yosemite4.cfg b/meta-facebook/meta-yosemite4/recipes-kernel/linux/linux-aspeed/yosemite4.cfg
index 5459bab..b04b0ff 100644
--- a/meta-facebook/meta-yosemite4/recipes-kernel/linux/linux-aspeed/yosemite4.cfg
+++ b/meta-facebook/meta-yosemite4/recipes-kernel/linux/linux-aspeed/yosemite4.cfg
@@ -43,3 +43,6 @@
 CONFIG_RTC_DRV_NCT3018Y=y
 # NCSI
 CONFIG_NCSI_OEM_CMD_GET_MAC=y
+# UART enable threads
+CONFIG_SERIAL_8250_NR_UARTS=9
+CONFIG_SERIAL_8250_RUNTIME_UARTS=9