disk: convert CONFIG_AMIGA_PARTITION to Kconfig

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Signed-off-by: Patrick Delaunay <patrick.delaunay73@gmail.com>
diff --git a/disk/part.c b/disk/part.c
index 4731ae9..ad38164 100644
--- a/disk/part.c
+++ b/disk/part.c
@@ -237,7 +237,7 @@
 #if CONFIG_IS_ENABLED(MAC_PARTITION) || \
 	CONFIG_IS_ENABLED(DOS_PARTITION) || \
 	CONFIG_IS_ENABLED(ISO_PARTITION) || \
-	defined(CONFIG_AMIGA_PARTITION) || \
+	CONFIG_IS_ENABLED(AMIGA_PARTITION) || \
 	defined(CONFIG_EFI_PARTITION)
 	puts ("\nPartition Map for ");
 	switch (dev_desc->if_type) {