samples: posix: gettimeofday: Fix fatal error caused by small stack

Fix #68727.

(cherry picked from commit cdb8f3c)

Original-Signed-off-by: Cui Wei <chris.wei.cui@foxmail.com>
GitOrigin-RevId: cdb8f3c
Change-Id: Ia7328a8f596bcbae06181fd2c4aaeb54d2fa4446
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/zephyr/+/5295753
Tested-by: ChromeOS Prod (Robot) <chromeos-ci-prod@chromeos-bot.iam.gserviceaccount.com>
Reviewed-by: Fabio Baltieri <fabiobaltieri@google.com>
Commit-Queue: Fabio Baltieri <fabiobaltieri@google.com>
Tested-by: Fabio Baltieri <fabiobaltieri@google.com>

samples/posix/gettimeofday/prj.conf

@@ -1,5 +1,5 @@
 # General config
-CONFIG_MAIN_STACK_SIZE=1088
+CONFIG_MAIN_STACK_SIZE=2048
 CONFIG_REQUIRES_FULL_LIBC=y
 CONFIG_POSIX_API=y
 CONFIG_SNTP=y