scmi: Prepare v0.4.0 release

Update CHANGELOG.md and Cargo.toml for v0.4.0 release.
This release adds SCMI extended sensor attributes support.

Signed-off-by: Milan Zamazal <mzamazal@redhat.com>

Cargo.lock

@@ -2076,7 +2076,7 @@ dependencies = [
 
 [[package]]
 name = "vhost-device-scmi"
-version = "0.3.0"
+version = "0.4.0"
 dependencies = [
  "assert_matches",
  "clap",

vhost-device-scmi/CHANGELOG.md

@@ -3,16 +3,22 @@
 
 ### Added
 
-- [[#798]](https://github.com/rust-vmm/vhost-device/pull/798) scmi: extended sensor attributes support
-
 ### Changed
 
 ### Fixed
 
-- [[#798]](https://github.com/rust-vmm/vhost-device/pull/798) Fix the wrong value number of remaining sensor axis descriptor.
-
 ### Deprecated
 
+## v0.4.0
+
+### Added
+
+- [[#798]](https://github.com/rust-vmm/vhost-device/pull/798) scmi: extended sensor attributes support
+
+### Fixed
+
+- [[#798]](https://github.com/rust-vmm/vhost-device/pull/798) Fix the wrong value number of remaining sensor axis descriptor.
+
 ## v0.3.0
 
 ### Added

vhost-device-scmi/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "vhost-device-scmi"
-version = "0.3.0"
+version = "0.4.0"
 authors = ["Milan Zamazal <mzamazal@redhat.com>"]
 description = "vhost-user SCMI backend device"
 repository = "https://github.com/rust-vmm/vhost-device"