i2c: delete dead code

libboard_zynq/src/i2c/mod.rs

@@ -2,14 +2,11 @@
 
 mod regs;
 pub mod eeprom;
-use super::clocks::Clocks;
 use super::slcr;
 use super::time::Microseconds;
 use embedded_hal::timer::CountDown;
 use libregister::{RegisterR, RegisterRW, RegisterW};
 
-const INVALID_BUS: &'static str = "Invalid I2C bus";
-
 pub struct I2C {
     regs: regs::RegisterWrapper,
     count_down: super::timer::global::CountDown<Microseconds>
@@ -45,7 +42,6 @@ impl I2C {
 
     fn ctor_common(gpio_output_mask: u16) -> Self {
         // Setup register block
-        let clocks = Clocks::get();
         let self_ = Self {
             regs: regs::RegisterWrapper::new(),
             count_down: unsafe { super::timer::GlobalTimer::get() }.countdown()

libboard_zynq/src/i2c/regs.rs

@@ -1,5 +1,3 @@
-use volatile_register::{RO, WO, RW};
-
 use libregister::{
     register, register_at,
     register_bit, register_bits