soc: mediatek: mtk-svs: Constify runtime-immutable members of svs_bank

Some members of struct svs_bank are not changed during runtime, so those
are not variables but constants: move all of those to a new structure
called svs_bank_pdata and refactor the code to make use of that and
reorder members by size where possible.
This effectively moves at least 50 bytes to the text segment.
While at it, also uniform the thermal zone names across the banks.

Link: https://lore.kernel.org/r/20231121125044.78642-19-angelogioacchino.delregno@collabora.comSigned-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>