esp32/boards/sdkconfig.base: Set default IDF log level to ERROR.

This commit changes the default logging level on all esp32 boards to ERROR.
The esp32 port is now stable enough that it makes sense to remove the info
logs to make the output cleaner, and to match other ports.  More verbose
logging can always be reenabled via esp.osdebug().

This also fixes issue #6354, error messages from NimBLE: the problem is
that ble.active(True) will cause the IDF's NimBLE port to reset the
"NimBLE" tag back to the default level (which was INFO prior to this
commit).  Even if the user had previously called esp.osdebug(None), because
the IDF is setting the "NimBLE" tag back to the default (INFO), the
messages will continue to be shown.

The one quirk is that if the user does want to see the additional logging,
then they must call esp.osdebug(0, 3) after ble.active(True) to undo the
IDF setting the level back to the default (now ERROR).  This means that
it's impossible (via Python/esp.osdebug) to see stack-startup logging,
you'd have to recompile with the default level changed back to INFO.

ports/esp32/boards/sdkconfig.base

@@ -11,6 +11,11 @@ CONFIG_APP_EXCLUDE_PROJECT_NAME_VAR=y
 # Bootloader config
 CONFIG_BOOTLOADER_LOG_LEVEL_WARN=y
 
+# Change default log level to "ERROR" (instead of "INFO")
+CONFIG_LOG_DEFAULT_LEVEL_INFO=n
+CONFIG_LOG_DEFAULT_LEVEL_ERROR=y
+CONFIG_LOG_DEFAULT_LEVEL=1
+
 # ESP32-specific
 CONFIG_ESP_TASK_WDT_CHECK_IDLE_TASK_CPU0=n
 CONFIG_ESP_TASK_WDT_CHECK_IDLE_TASK_CPU1=n