pinctrl: k210: Deprecate SOC_CANAAN and use SOC_CANAAN_K210

pinctrl: k210: Deprecate SOC_CANAAN and use SOC_CANAAN_K210

Since SOC_FOO should be deprecated from patch [1], and cleanup for other
SoCs is already in the mailing list [2,3,4], we remove the use of
SOC_CANAAN and introduced SOC_CANAAN_K210 for K210-specific drivers,

Thus, we replace its drivers depends on SOC_CANAAN_K210 and default select
when it has the symbol SOC_CANAAN_K210.

[1] https://lore.kernel.org/linux-riscv/20221121221414.109965-1-conor@kernel.org/
[2] https://lore.kernel.org/linux-riscv/20240305-praying-clad-c4fbcaa7ed0a@spud/
[3] https://lore.kernel.org/linux-riscv/20240305-fled-undrilled-41dc0c46bb29@spud/
[4] https://lore.kernel.org/linux-riscv/20240305-stress-earflap-d7ddb8655a4d@spud/

Signed-off-by: Yangyu Chen <cyy@cyyself.name>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>