Remove common clock types

Different STM32 RCC peripherals have different capabilities and register
values. Define types for each RCC types inside each module to ensure
full range of capabilities for each family can be used

embassy-stm32/src/rcc/l1/mod.rs

@@ -1,4 +1,3 @@
-pub use super::types::*;
 use crate::pac;
 use crate::peripherals::{self, RCC};
 use crate::rcc::{get_freqs, set_freqs, Clocks};
@@ -21,6 +20,58 @@ pub enum ClockSrc {
     HSI,
 }
 
+/// MSI Clock Range
+///
+/// These ranges control the frequency of the MSI. Internally, these ranges map
+/// to the `MSIRANGE` bits in the `RCC_ICSCR` register.
+#[derive(Clone, Copy)]
+pub enum MSIRange {
+    /// Around 65.536 kHz
+    Range0,
+    /// Around 131.072 kHz
+    Range1,
+    /// Around 262.144 kHz
+    Range2,
+    /// Around 524.288 kHz
+    Range3,
+    /// Around 1.048 MHz
+    Range4,
+    /// Around 2.097 MHz (reset value)
+    Range5,
+    /// Around 4.194 MHz
+    Range6,
+}
+
+impl Default for MSIRange {
+    fn default() -> MSIRange {
+        MSIRange::Range5
+    }
+}
+
+/// AHB prescaler
+#[derive(Clone, Copy, PartialEq)]
+pub enum AHBPrescaler {
+    NotDivided,
+    Div2,
+    Div4,
+    Div8,
+    Div16,
+    Div64,
+    Div128,
+    Div256,
+    Div512,
+}
+
+/// APB prescaler
+#[derive(Clone, Copy)]
+pub enum APBPrescaler {
+    NotDivided,
+    Div2,
+    Div4,
+    Div8,
+    Div16,
+}
+
 type Ppre = u8;
 impl Into<Ppre> for APBPrescaler {
     fn into(self) -> Ppre {