stm32mp: stm32prog: accept device without partition

When partition is not found it is not a error but the selected
device as no partition scheme, so nothing to check.

The command need to continue to the next part_id.

This patch correct an issue for ram0 target.

[backport of commit 53de79fecc ("stm32mp: stm32prog: accept device without partition")]

Fixes: ffc405e63b ("stm32mp: stm32prog: add upport of partial update")
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Change-Id: Ica5db473ac0416c71b18f52d0b221e37d1f1a9aa

arch/arm/mach-stm32mp/cmd_stm32prog/stm32prog.c

@@ -768,9 +768,8 @@ static int init_device(struct stm32prog_data *data,
 			part_found = true;
 		}
 
+		/* no partition for this device */
 		if (!part_found) {
-			stm32prog_err("%s (0x%x): Invalid partition",
-				      part->name, part->id);
 			pr_debug("\n");
 			continue;
 		}