mfd: pm8008: Drop bogus i2c module alias

Prior to commit af503716ac14 ("i2c: core: report OF style module alias
for devices registered via OF") drivers using OF matching needed an i2c
module alias such as "i2c:pm8008" for module autoloading to work.

Drop the bogus i2c alias from the pm8008 driver which was merged long
after i2c core was fixed and whose alias did not match the driver name
("pm8008") to begin with.

Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20230526091646.17318-3-johan+linaro@kernel.org