otg: Increase max amount of EPs.

H7 has 9 EPs, registers seem laid out for up to 16 EPs so use that.

data/registers/otg_v1.yaml

@@ -197,28 +197,28 @@ block/OTG:
     - name: DIEPCTL
       description: Device IN endpoint control register
       array:
-        len: 8
+        len: 16
         stride: 32
       byte_offset: 2304
       fieldset: DIEPCTL
     - name: DIEPINT
       description: Device IN endpoint interrupt register
       array:
-        len: 8
+        len: 16
         stride: 32
       byte_offset: 2312
       fieldset: DIEPINT
     - name: DIEPTSIZ
       description: Device IN endpoint transfer size register
       array:
-        len: 8
+        len: 16
         stride: 32
       byte_offset: 2320
       fieldset: DIEPTSIZ
     - name: DTXFSTS
       description: Device IN endpoint transmit FIFO status register
       array:
-        len: 8
+        len: 16
         stride: 32
       byte_offset: 2328
       access: Read
@@ -226,21 +226,21 @@ block/OTG:
     - name: DOEPCTL
       description: Device OUT endpoint control register
       array:
-        len: 8
+        len: 16
         stride: 32
       byte_offset: 2816
       fieldset: DOEPCTL
     - name: DOEPINT
       description: Device OUT endpoint interrupt register
       array:
-        len: 8
+        len: 16
         stride: 32
       byte_offset: 2824
       fieldset: DOEPINT
     - name: DOEPTSIZ
       description: Device OUT endpoint transfer size register
       array:
-        len: 8
+        len: 16
         stride: 32
       byte_offset: 2832
       fieldset: DOEPTSIZ
@@ -251,7 +251,7 @@ block/OTG:
     - name: FIFO
       description: Device endpoint / host channel FIFO register
       array:
-        len: 8
+        len: 16
         stride: 4096
       byte_offset: 4096
       fieldset: FIFO