net: ftmac100: fix endianness-related issues from 'sparse'

Sparse found a number of endianness-related issues of these kinds:

.../ftmac100.c:192:32: warning: restricted __le32 degrades to integer

.../ftmac100.c:208:23: warning: incorrect type in assignment (different base types)
.../ftmac100.c:208:23: expected unsigned int rxdes0
.../ftmac100.c:208:23: got restricted __le32 [usertype]

.../ftmac100.c:249:23: warning: invalid assignment: &=
.../ftmac100.c:249:23: left side has type unsigned int
.../ftmac100.c:249:23: right side has type restricted __le32

.../ftmac100.c:527:16: warning: cast to restricted __le32

Change type of some fields from 'unsigned int' to '__le32' to fix it.

Signed-off-by: Sergei Antonov <[e-mail]>
Reviewed-by: Andrew Lunn <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Paolo Abeni <[e-mail]>

drivers/net/ethernet/faraday/ftmac100.h

···
  * Transmit descriptor, aligned to 16 bytes
  */
 struct ftmac100_txdes {
-	unsigned int	txdes0;
-	unsigned int	txdes1;
-	unsigned int	txdes2;	/* TXBUF_BADR */
+	__le32		txdes0;
+	__le32		txdes1;
+	__le32		txdes2;	/* TXBUF_BADR */
 	unsigned int	txdes3;	/* not used by HW */
 } __attribute__ ((aligned(16)));
 
···
  * Receive descriptor, aligned to 16 bytes
  */
 struct ftmac100_rxdes {
-	unsigned int	rxdes0;
-	unsigned int	rxdes1;
-	unsigned int	rxdes2;	/* RXBUF_BADR */
+	__le32		rxdes0;
+	__le32		rxdes1;
+	__le32		rxdes2;	/* RXBUF_BADR */
 	unsigned int	rxdes3;	/* not used by HW */
 } __attribute__ ((aligned(16)));