board: ti: am6x: Restore do_board_detect functions

board: ti: am6x: Restore do_board_detect functions

This patch fixes a boot failure on the AM64x EVM that was introduced when the do_board_detect function was removed during a refactoring.

It restores the do_board_detect function for the AM64x, AM62x, and AM65x boards to ensure the common board detection logic is executed correctly.

Fixes: 804b80288ac ("board: am65x: Use generic AM6x board detection function")
Fixes: ce56e553c31 ("board: am64x: Use generic AM6x board detection functions")
Fixes: ff1b83c095c ("board: am62x: Add support for reading eeprom data")
Signed-off-by: Guillaume La Roque (TI.com) <glaroque@baylibre.com>