USBD_GS_CAN_PrepareReceive() is only used in usbd_gs_can.c, remove
function prototype from usbd_gs_can.h, mark as static, and move in
front to avoid forward declaration.
Move CAN_INTERFACE and CAN_CLOCK_SPEED to the config file as the CAN
clock can vary based on HW implementation.
Better to add it here than to keep adding defines into the
usbd_gs_can.h file.
CAN_INTERFACE can vary based on the number of channels you are using
so also makes sense to add here even though most chips use the same
interface ID.
with help from include-what-you-use (iwyu-tool). It's not quite clever
enough to understand our intent of including "hal_include.h" but still
offers good suggestions.
commit 46b01339f5eeab1157d "Add new mode to pad output usb packets
to max packet size for better ..." introduced an unused function
USBD_GS_CAN_GetPadPacketsToMaxPacketSize, get rid of it.
Needed for hcan->TxState to reset. In some cases when the host reboots, the TxState get locked forever and there's no way to recover other than resetting the controller.
Some files have Windows line endings which is annoying, since pathes
won't apply, diffs looks ugly etc. So do convert the few files which
have Windows line endings to use Unix line endings as well.
