disk: convert CONFIG_EFI_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_efi.c b/disk/part_efi.c
index 1924338..f1b7116 100644
--- a/disk/part_efi.c
+++ b/disk/part_efi.c
@@ -171,7 +171,7 @@
 	gpt_h->header_crc32 = cpu_to_le32(calc_crc32);
 }
 
-#ifdef CONFIG_EFI_PARTITION
+#if CONFIG_IS_ENABLED(EFI_PARTITION)
 /*
  * Public Functions (include/part.h)
  */