mfd: ti_am335x_tscadc: Drop extra spacing when declaring stack variables

Many variables will be updated (renamed, dropped, added) in the upcoming
changes, so let's simplify the style to avoid messing with spaces over
and over again.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20211015081506.933180-12-miquel.raynal@bootlin.com