Add processor target (cortex-m33), linker script (2048K flash, 768K RAM),
and arduino-uno-q board target. Runtime initializes 160MHz clock via PLL1
from HSI16, with PWR Range 1 and EPOD booster.
Also add psctype abstraction for timer PSC register width, needed because
the U5 SVD defines PSC as a 16-bit register.
Recent changes in stm32-svd result in a change from previous
16-bit register access to 32-bit access.
Both access types are allowed, according to the register manuals.
Do it all at once in preparation for Go 1.18 support.
To make this commit, I've simply modified the `fmt-check` Makefile
target to rewrite files instead of listing the differences. So this is a
fully mechanical change, it should not have introduced any errors.
deadprogram
Michael Teichgräber
Yurii Soldak
sago35
Ayke van Laethem
Kenneth Bell