soc: mediatek: mtk-dvfsrc: remove an unused variable

soc: mediatek: mtk-dvfsrc: remove an unused variable

This structure was left unused by a previous patch:

drivers/soc/mediatek/mtk-dvfsrc.c:542:43: error: unused variable 'dvfsrc_bw_constr_mt8195' [-Werror,-Wunused-const-variable]

Fixes: b06785283ec1 ("soc: mediatek: mtk-dvfsrc: Rename and move bw constraints data")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20250423162958.2223689-1-arnd@kernel.org
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>