net: ethernet: mtk_eth_soc: fix typo for declaration MT7988 ESW capability

Since MTK_ESW_BIT is a bit number rather than a bitmap, it causes
MTK_HAS_CAPS to produce incorrect results. This leads to the ETH
driver not declaring MAC capabilities correctly for the MT7988 ESW.

Fixes: 445eb644 ("net: ethernet: mtk_eth_soc: add basic support for MT7988 SoC")
Signed-off-by: Bo-Cun Chen <bc-bocun.chen@mediatek.com>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Reviewed-by: Michal Swiatkowski <michal.swiatkowski@linux.intel.com>
Link: https://patch.msgid.link/b8b37f409d1280fad9c4d32521e6207f63cd3213.1747110258.git.daniel@makrotopia.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>