Remove BRR definition for stm32l151xc devices #1124
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Bug: Cannot set GPIO to low on stm32l151xc
The issue was described in #983
According to the reference manual (RM0038 Rev 16),
chapter 7.4.11 - GPIO bit reset register, the bit reset register (BRR)
is not available on stm32l151xc (Cat. 3) devices.
A PR on upstream project as been open: STMicroelectronics/STM32CubeL1#5