Remove the stm32f301 subdevice features

The stm32f301x{b,c,d,e} models don't exist!
There are stm32f301x{6,8} models, but those differ only in flash size, so we
probably won't need separate features for these.

Author: teskje

Cargo.toml

@@ -56,11 +56,7 @@ device-selected = []
 direct-call-deprecated = []
 rt = ["stm32f3/rt"]
 # Any Changes here should be mirrored in README.md and src/lib.rs
-stm32f301 = ["stm32f3/stm32f301", "direct-call-deprecated"]
-stm32f301xb = ["stm32f301", "device-selected"]
-stm32f301xc = ["stm32f301", "device-selected"]
-stm32f301xd = ["stm32f301", "device-selected"]
-stm32f301xe = ["stm32f301", "device-selected"]
+stm32f301 = ["stm32f3/stm32f301", "device-selected"]
 stm32f318 = ["stm32f3/stm32f3x8", "device-selected"]
 stm32f302 = ["stm32f3/stm32f302", "direct-call-deprecated"]
 stm32f302xb = ["stm32f302", "device-selected"]

src/lib.rs

@@ -6,10 +6,7 @@
    Please select one of the following
 
    (Note: `x` denotes any character in [a-z])
-   *   stm32f301xb
-   *   stm32f301xc
-   *   stm32f301xd
-   *   stm32f301xe
+   *   stm32f301
    *   stm32f318
    *   stm32f302xb
    *   stm32f302xc
@@ -43,10 +40,7 @@ compile_error!(
     Please select one of the following
 
     (Note: `x` denotes any character in [a-z])
-    *   stm32f301xb
-    *   stm32f301xc
-    *   stm32f301xd
-    *   stm32f301xe
+    *   stm32f301
     *   stm32f318
     *   stm32f302xb
     *   stm32f302xc