all: Drop unnecessary access mode patches
Due to a change in atdf2svd [1], all these access mode patches are no
longer required - they are now translated correctly from the vendor
source file.
Drop all patches which no longer change the output (the code before and
after this change is equivalent when using the new atdf2svd).
[1]: https://github.com/Rahix/atdf2svd/commit/a189276b3540b647fab832946edf0acf39730a0e
patch: spi: Patch enumerated values for SPI prescaler
Rename the values for the SPI clock prescaler from VAL_0xXX to more
meaningful identifiers.
Signed-off-by: Rahix <rahix@rahix.de>
Add support for atmega328pb