mfd: stm32-timers: Drop unused TIM_DIER_CC_IE

This macro is misleading as

	TIM_DIER_CC_IE(1) == TIM_DIER_CC2IE

. The only user was updated to use TIM_DIER_CCxIE() instead which
doesn't suffer from this mismatch, so TIM_DIER_CC_IE can be dropped.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://lore.kernel.org/r/6c8fcc4ed159992a1dbb0796087e6ceb10c39c96.1718791090.git.u.kleine-koenig@baylibre.com


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