Wrong alternate function mappings for GPIO banks

[Sh3Rm4n]

As discussed in #116 (comment), the alternate function mapping for the gpios are not 100 % according to the device datasheets (p.43) , in which the alternate function table is listed.

stm32f3xx-hal/src/gpio.rs

Lines 921 to 930 in 2ea16b4

	PB0: (pb0, 0, Input<Floating>, moder0, AFRL, afrl0, bs0, br0, odr0, idr0, pupdr0, ot0, [
	AF3: (into_af3, af3,),
	AF15: (into_af15, af15,),
	], [
	AF2: (into_af2, af2, ["stm32f302", "stm32f303", "stm32f334", "stm32f328", "stm32f358", "stm32f378", "stm32f398",],),
	AF4: (into_af4, af4, ["stm32f303xb", "stm32f303xc", "stm32f303xd", "stm32f303xe", "stm32f358", "stm32f398",],),
	AF5: (into_af5, af5, ["stm32f378",],),
	AF6: (into_af6, af6, ["stm32f301", "stm32f318", "stm32f302", "stm32f303", "stm32f334", "stm32f328", "stm32f358", "stm32f398",],),
	AF10: (into_af10, af10, ["stm32f378",],),
	]),

[teskje]

With #129 merged, this should be fixed now. I'm closing this issue. If anyone finds specific instances of wrong mappings we can reopen again.