mfd: stm32-timers: Unify alignment of register definition

Use tabs consistently for indention and properly align register names,
values and comments. This improves readability (at least for my eyes).
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://lore.kernel.org/r/da3b7f9af5794d7463aa62cbaa7251abf1af2018.1718791090.git.u.kleine-koenig@baylibre.comSigned-off-by: Lee Jones <lee@kernel.org>