net: sparx5: fix bitmask on 32-bit targets

I saw the build failure that was fixed in commit 6387f65e ("net:
sparx5: fix compiletime_assert for GCC 4.9") and noticed another
issue that was introduced in the same patch: Using GENMASK() to
create a 64-bit mask does not work on 32-bit architectures.

This probably won't ever happen on this driver since it's specific
to a 64-bit SoC, but it's better to write it portably, so use
GENMASK_ULL() instead.

Fixes: f3cad261 ("net: sparx5: add hostmode with phylink support")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/microchip/sparx5/sparx5_netdev.c

@@ -32,7 +32,7 @@ static void __ifh_encode_bitfield(void *ifh, u64 value, u32 pos, u32 width)
 	u32 byte = (35 - (pos / 8));
 	/* Calculate the Start bit position in the Start IFH byte */
 	u32 bit  = (pos % 8);
-	u64 encode = GENMASK(bit + width - 1, bit) & (value << bit);
+	u64 encode = GENMASK_ULL(bit + width - 1, bit) & (value << bit);
 
 	/* The b0-b7 goes into the start IFH byte */
 	if (encode & 0xFF)