sw:matcha: Fix rust build breakage from bare-io dependency

Following
https://spacebeaker-review.googlesource.com/c/shodan/kata/projects/processmanager/+/13240
to use core2 Cursor to support bare-io functionality.

Change-Id: I530792445bbe9568f0794dd357d8cf3ac64c78f8

app/Cargo.toml

diff --git a/app/Cargo.toml b/app/Cargo.toml
index 7876a41..a48e763 100644
--- a/app/Cargo.toml
+++ b/app/Cargo.toml
@@ -4,7 +4,7 @@
 edition = "2018"
 
 [dependencies]
-bare-io = "0.2"
+core2 = { version = "0.3", default-features = false }
 libtock         = { path = "../../libtock-rs" }
 libtock_core    = { path = "../../libtock-rs/core" }
 matcha_config   = { path = "../config" }

app/src/dprintf.rs

diff --git a/app/src/dprintf.rs b/app/src/dprintf.rs
index 179cfdf..c9c75e0 100644
--- a/app/src/dprintf.rs
+++ b/app/src/dprintf.rs
@@ -1,6 +1,6 @@
 //! App-side dprintf macro that calls through to the debug_uart capsule.
 
-use bare_io::{Cursor, Write};
+use core2::io::{Cursor, Write};
 use core::fmt;
 use libtock::syscalls;
 use matcha_config::*;

hal/Cargo.toml

diff --git a/hal/Cargo.toml b/hal/Cargo.toml
index bd27c2b..82d74bc 100644
--- a/hal/Cargo.toml
+++ b/hal/Cargo.toml
@@ -4,6 +4,6 @@
 edition = "2018"
 
 [dependencies]
-bare-io         = "0.2"
+core2 = { version = "0.3", default-features = false }
 kernel          = { path = "../../tock/kernel" }
 matcha_config   = { path = "../config" }

hal/src/debug_uart.rs

diff --git a/hal/src/debug_uart.rs b/hal/src/debug_uart.rs
index 183736d..9dcc161 100644
--- a/hal/src/debug_uart.rs
+++ b/hal/src/debug_uart.rs
@@ -1,6 +1,6 @@
 //! Unsafe synchronous dump-string-to-uart impl and macro for debugging.
 
-use bare_io::{Cursor, Write};
+use core2::io::{Cursor, Write};
 use core::fmt;
 
 pub const TX_BUSY: *const u32 = 0x4000_0010 as *const u32;

platform/Cargo.toml

diff --git a/platform/Cargo.toml b/platform/Cargo.toml
index 821688e..e3c1b04 100644
--- a/platform/Cargo.toml
+++ b/platform/Cargo.toml
@@ -6,8 +6,6 @@
 edition = "2018"
 
 [dependencies]
-bare-io = "0.2"
-
 components = { path = "../../tock/boards/components" }
 rv32i      = { path = "../../tock/arch/rv32i" }
 capsules   = { path = "../../tock/capsules" }
@@ -18,4 +16,4 @@
 matcha_capsules = { path = "../capsules" }
 matcha_config   = { path = "../config" }
 matcha_utils    = { path = "../utils" }
-matcha_hal      = { path = "../hal" }
\ No newline at end of file
+matcha_hal      = { path = "../hal" }

utils/Cargo.toml

diff --git a/utils/Cargo.toml b/utils/Cargo.toml
index 2c51401..8d773c0 100644
--- a/utils/Cargo.toml
+++ b/utils/Cargo.toml
@@ -4,6 +4,5 @@
 edition = "2018"
 
 [dependencies]
-bare-io = "0.2"
 
-matcha_hal = { path = "../hal" }
\ No newline at end of file
+matcha_hal = { path = "../hal" }