Document BM8563 RTC configuration for M5Stack-Core2

[lboue]

Brief description of the changes

Document BM8563 RTC configuration for M5Stack-Core2

Type of changes

• New device
• Update existing device
• Removing a device
• General cleanup
• Other

Checklist:

• There are no passwords or secrets references in any examples.
  The only exceptions are !secret wifi_ssid and !secret wifi_password.
• The wifi or ethernet block has no static / manual ip address specified.
• The first configuration provided should be hardware definitions only.
  A more involved example can be provided in a separate configuration block.

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[Copilot]

Pull request overview

This PR adds documentation for the BM8563 RTC component to the M5Stack-Core2 device page, including a configuration example showing how to synchronize the RTC with Home Assistant.

• Adds a new "RTC" section with BM8563 configuration example
• Updates the Notes section to reflect that an ESPHome component now exists for the BM8563 RTC
• Includes advanced example showing boot-time RTC reading and Home Assistant synchronization

[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 2 comments.