Remove duplicates in Can driver

[ahmedwahdan]

• Duplicate CAN0_BASE_ADDRESS -> It should be taken from the CanCfg struct object.
• Use #define instead of variable for bClrPendingInt as it doesn't change.
• Multiple defeintion for functions _CANDataRegRead & CANDataRegWrite as they are copied from the canlib.c
• Use #define for ui16MaskReg_1 & ui16MaskReg_2 in the following code as they doesn't change:

  HWREG(ui32Base + CAN_O_IF1MSK1) = ui16MaskReg_1; HWREG(ui32Base + CAN_O_IF1MSK2) = ui16MaskReg_2;