fix ltdc_v1.yaml bfcr wrong definition

data/registers/ltdc_v1.yaml

@@ -145,14 +145,16 @@ fieldset/BCCR:
 fieldset/BFCR:
   description: Layerx Blending Factors Configuration Register
   fields:
-  - name: BF
+  - name: BF2
     description: Blending Factor 2
     bit_offset: 0
     bit_size: 3
-    array:
-      len: 2
-      stride: 8
     enum: BF2
+  - name: BF1
+    description: Blending Factor 1
+    bit_offset: 8
+    bit_size: 3
+    enum: BF1
 fieldset/BPCR:
   description: Back Porch Configuration Register
   fields:
@@ -470,6 +472,15 @@ fieldset/WVPCR:
     description: Window Vertical Stop Position
     bit_offset: 16
     bit_size: 11
+enum/BF1:
+  bit_size: 3
+  variants:
+  - name: Constant
+    description: BF1 = constant alpha
+    value: 4
+  - name: Pixel
+    description: BF1 = pixel alpha * constant alpha
+    value: 7
 enum/BF2:
   bit_size: 3
   variants: