!squash: Copy W25Qxx_STM32 driver.

So new contributors can see the diff in the next commit clearly. We can squash this later.

Author: laurensvalk

bricks/_common/sources.mk

@@ -120,6 +120,7 @@ PBIO_SRC_C = $(addprefix lib/pbio/,\
 	drv/battery/battery_nxt.c \
 	drv/battery/battery_test.c \
 	drv/battery/battery_virtual.c \
+	drv/block_device/block_device_ev3.c \
 	drv/block_device/block_device_flash_stm32.c \
 	drv/block_device/block_device_test.c \
 	drv/block_device/block_device_w25qxx_stm32.c \