Move OTA max data buffer number to project configurations.

[ActoryOu]

Move OTA max data buffer number to project configurations.

Description

As #96, #97, #98 describe, there are compile error messages with OTA demo enabled.

• /components/FreeRTOS-Libraries-Integration-Tests/FreeRTOS-Libraries-Integration-Tests/src/ota_pal_test.cmake not found, and that file is removed at the latest release.
• Missing otaconfigMAX_NUM_OTA_DATA_BUFFERS definition.

Test Steps

1. idf.py menuconfig (Featured FreeRTOS IoT Integration -> Enable OTA demo -> check)
2. idf.py build

Checklist:

• I have tested my changes. No regression in existing tests.
• [NA] I have modified and/or added unit-tests to cover the code changes in this Pull Request.

Related Issue

#96, #97, #98

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.