board: stm32mp1: display reference only for STMicroelectronics board

Display the reference MBxxxx found in OTP49
only for STMicroelectronics boards when CONFIG_CMD_STBOARD
is activated.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Acked-by: Patrice Chotard <patrice.chotard@st.com>

# Conflicts:
#	board/st/stm32mp1/stm32mp1.c
diff --git a/board/st/stm32mp1/stm32mp1.c b/board/st/stm32mp1/stm32mp1.c
index 4dd0098..07f5344 100644
--- a/board/st/stm32mp1/stm32mp1.c
+++ b/board/st/stm32mp1/stm32mp1.c
@@ -105,20 +105,20 @@
 	puts("\n");
 
 	/* display the STMicroelectronics board identification */
-	ret = uclass_get_device_by_driver(UCLASS_MISC,
-					  DM_GET_DRIVER(stm32mp_bsec),
-					  &dev);
-
-	if (!ret)
-		ret = misc_read(dev, STM32_BSEC_SHADOW(BSEC_OTP_BOARD),
-				&otp, sizeof(otp));
-	if (ret > 0 && otp) {
-		printf("Board: MB%04x Var%d.%d Rev.%c-%02d\n",
-		       otp >> 16,
-		       (otp >> 12) & 0xF,
-		       (otp >> 4) & 0xF,
-		       ((otp >> 8) & 0xF) - 1 + 'A',
-		       otp & 0xF);
+	if (CONFIG_IS_ENABLED(CMD_STBOARD)) {
+		ret = uclass_get_device_by_driver(UCLASS_MISC,
+						  DM_GET_DRIVER(stm32mp_bsec),
+						  &dev);
+		if (!ret)
+			ret = misc_read(dev, STM32_BSEC_SHADOW(BSEC_OTP_BOARD),
+					&otp, sizeof(otp));
+		if (ret > 0 && otp)
+			printf("Board: MB%04x Var%d.%d Rev.%c-%02d\n",
+			       otp >> 16,
+			       (otp >> 12) & 0xF,
+			       (otp >> 4) & 0xF,
+			       ((otp >> 8) & 0xF) - 1 + 'A',
+			       otp & 0xF);
 	}
 
 	return 0;