[master][PATCH] am62lxx-evm: Override serial console to ttyS0 only

The am62lxx-evm board only has ttyS0 available. The k3 default
SERIAL_CONSOLES inherited includes ttyS2, which causes
systemd to wait indefinitely for a console that never appears,
significantly increasing boot time and degrading user experience.

Override SERIAL_CONSOLES to specify only ttyS0, allowing the boot
process to proceed normally without waiting for unavailable consoles.

Signed-off-by: Yogesh Hegde <[email protected]>
---

Boot time is increased from 33s to 2m18s.
Boot time is measured from power on to TI LVGL demo
running on HDMI Display. 

Logs: 

root@am62lxx-evm:~# systemd-analyze critical-chain ti-lvgl-demo.service
The time when unit became active or started is printed after the "@" character.
The time the unit took to start is printed after the "+" character.
ti-lvgl-demo.service @1min 32.588s
`-multi-user.target @1min 32.577s
  `-getty.target @1min 32.575s
    `[email protected] @13.002s
      `-systemd-user-sessions.service @10.847s +660ms
        `-network.target @10.582s
          `-systemd-networkd.service @8.748s +1.799s
            `-network-pre.target @8.735s
              `-iptables.service @7.477s +920ms
                `-basic.target @7.363s
                  `-dbus-broker.service @6.661s +466ms
                    `-dbus.socket @6.310s +434us
                      `-sysinit.target @6.263s
                        `-systemd-vconsole-setup.service @18.198s +391ms
                          `-systemd-journald.socket @2.781s +335us
                            `-system.slice @1.282s
                              `--.slice @1.282s

From the time analysis log, `getty.target` takes 1min 32 secs to bootup due to 
[email protected] failed. This service fails because there is no 
hardware associated with ttyS2. 

---
 meta-ti-bsp/conf/machine/am62lxx-evm.conf | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/meta-ti-bsp/conf/machine/am62lxx-evm.conf b/meta-ti-bsp/conf/machine/am62lxx-evm.conf
index 677d6955..edfb4057 100644
--- a/meta-ti-bsp/conf/machine/am62lxx-evm.conf
+++ b/meta-ti-bsp/conf/machine/am62lxx-evm.conf
@@ -4,6 +4,8 @@
 
 require conf/machine/include/am62lxx.inc
 
+SERIAL_CONSOLES = "115200;ttyS0"
+
 IMAGE_FSTYPES += "ubifs ubi"
 
 MKUBIFS_ARGS ?= "-F -m 4096 -e 258048 -c 12000"
-- 
2.34.1