dts: arm: st: f0: fix timer 1 interrupt names

Timer 1 has two interrupts on STM32F0: TIM1_BRK_UP_TRG_COM_IRQn (13) and
TIM1_CC_IRQn (14). "brk" interrupt name does not reflect all the events
supported by the interrupt, so it has been renamed to "brk_up_trg_com".
On all other series except G0 timer 1 has a specific interrupt for each
event, so in such case "brk" is just fine.

Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>