configs: sandbox_defconfig: CONFIG_LOG_MAX_LEVEL=9

Without setting CONFIG_LOG_MAX_LEVEL to a value above 6 we will not detect
NULL dereferences and other errors in log_debug() calls.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/sandbox_defconfig b/configs/sandbox_defconfig
index 572cf8e..d50ce91 100644
--- a/configs/sandbox_defconfig
+++ b/configs/sandbox_defconfig
@@ -31,6 +31,8 @@
 CONFIG_CONSOLE_RECORD_OUT_SIZE=0x6000
 CONFIG_PRE_CONSOLE_BUFFER=y
 CONFIG_LOG=y
+CONFIG_LOG_MAX_LEVEL=9
+CONFIG_LOG_DEFAULT_LEVEL=6
 CONFIG_DISPLAY_BOARDINFO_LATE=y
 CONFIG_STACKPROTECTOR=y
 CONFIG_ANDROID_AB=y