spi: remove useless enums.

data/registers/spi_v2.yaml

@@ -270,7 +270,6 @@ fieldset/SR:
       description: Underrun flag
       bit_offset: 3
       bit_size: 1
-      enum: UDR
     - name: CRCERR
       description: CRC error flag
       bit_offset: 4
@@ -291,7 +290,6 @@ fieldset/SR:
       description: frame format error
       bit_offset: 8
       bit_size: 1
-      enum: FRE
     - name: FRLVL
       description: FIFO reception level
       bit_offset: 9
@@ -471,15 +469,6 @@ enum/DS:
     - name: SixteenBit
       description: 16-bit
       value: 15
-enum/FRE:
-  bit_size: 1
-  variants:
-    - name: NoError
-      description: No frame format error
-      value: 0
-    - name: Error
-      description: A frame format error occurred
-      value: 1
 enum/FRF:
   bit_size: 1
   variants:
@@ -648,12 +637,3 @@ enum/RXONLY:
     - name: OutputDisabled
       description: Output disabled (Receive-only mode)
       value: 1
-enum/UDR:
-  bit_size: 1
-  variants:
-    - name: NoUnderrun
-      description: No underrun occurred
-      value: 0
-    - name: Underrun
-      description: Underrun occurred
-      value: 1