soc: mediatek: mtk-dvfsrc: Rename and move bw constraints data

soc: mediatek: mtk-dvfsrc: Rename and move bw constraints data

Rename the MT8183 and MT8195 bandwidth constraints data structure
to, respectively, dvfsrc_bw_constr_v1 and dvfsrc_bw_constr_v2, as
the actual constraints are depending on the DVFSRC version rather
than on the SoC.

While at it, to prepare for adding a new SoC, also move the two
structures at the start of the platform data code section.

Link: https://lore.kernel.org/r/20250410144019.475930-5-angelogioacchino.delregno@collabora.com
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>