Fix missed feature dependencies

Author: david-sawatzke

Cargo.toml

@@ -47,8 +47,8 @@ stm32f042 = ["stm32f0/stm32f0x2"]
 stm32f030 = ["stm32f0/stm32f0x0"]
 stm32f030x4 = ["stm32f030x6"]
 stm32f030x6 = ["stm32f030"]
-stm32f030x8 = ["stm32f0/stm32f0x0"]
-stm32f030xc = ["stm32f0/stm32f0x0"]
+stm32f030x8 = ["stm32f030", "stm32f0/stm32f0x0"]
+stm32f030xc = ["stm32f030", "stm32f0/stm32f0x0"]
 
 [profile.dev]
 debug = true