N6 Fix IC Selection

Author: jake-taf

data/registers/rcc_n6.yaml

@@ -11347,16 +11347,16 @@ enum/ICSEL:
     bit_size: 2
     variants:
         - name: PLL1
-          description: pll1_ck is selected (default after reset).
+          description: pll1_ck is selected.
           value: 0
         - name: PLL2
           description: pll2_ck is selected.
           value: 1
-        - name: HSI_OSC_DIV4
-          description: hsi_ck = hsi_osc_ck / 4.
+        - name: PLL3
+          description: pll3_ck is selected.
           value: 2
-        - name: HSI_OSC_DIV8
-          description: hsi_ck = hsi_osc_ck / 8.
+        - name: PLL4
+          description: pll4_ck is selected.
           value: 3
 enum/ICLOCK:
     bit_size: 1