toradex: Fix recursive call to checkboard

Since checkboard() is used instead of show_board_info(), in case toradex
config block is missing or malformed, checkboard is recursively called.
It prints a long list of "MISSING TORADEX CONFIG BLOCK" till the stack
is full.

Fixes: edb0ecd187 ("toradex: Use checkboard() instead of show_board_info()")
Acked-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Tested-by: Marcel Ziswiler <marcel.ziswiler@toradex.com> # Verdin iMX8M Plus
Signed-off-by: Emanuele Ghidoli <emanuele.ghidoli@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>

board/toradex/common/tdx-common.c

@@ -103,7 +103,6 @@ int tdx_checkboard(void)
 	if (read_tdx_cfg_block()) {
 		printf("MISSING TORADEX CONFIG BLOCK\n");
 		get_mac_from_serial(tdx_serial, &tdx_eth_addr);
-		checkboard();
 	} else {
 		snprintf(tdx_serial_str, sizeof(tdx_serial_str),
 			 "%08u", tdx_serial);