mfd: axp20x: AXP717: Add AXP717_TS_PIN_CFG to writeable regs

Add AXP717_TS_PIN_CFG (register 0x50) to the table of writeable
registers so that the temperature sensor can be configured by the
battery driver.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Link: https://lore.kernel.org/r/20250204155835.161973-3-macroalpha82@gmail.com


Signed-off-by: Lee Jones <lee@kernel.org>