Add missing PWM pin definition for expansion bus

Author: ppescher

variants/POLARIS_V1/PeripheralPins.c

@@ -90,6 +90,7 @@ const PinMap PinMap_PWM[] = {
  {PA_2, TIM15, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF14_TIM15, 1, 0)}, // TIM15_CH1
  {PE_0, TIM16, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF14_TIM16, 1, 0)}, // TIM16_CH1
  {PE_9, TIM1, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM1, 1, 0)}, // TIM1_CH1
+ {PA_15, TIM2, STM_PIN_DATA_EXT(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF1_TIM2, 1, 0)}, // TIM2_CH1
  {NC, NP, 0}
 };
 #endif