pwm: stm32-lp: Remove useless loop in stm32_pwm_lp_remove()

LPTimer has only one pwm channel (npwm = 1). Remove useless for loop
in remove routine.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>