CMSIS include files from Atmel for SAMR21

It is unclear which version of ASF was used for the first implementation of samr21 (it was called samd21).

Since then the files has been updated using a distribution from Atmel Currently we're using sam0/utils/cmsis/samr21 from asf-3.21.0.7z.

Trailing White Space

Because of the whitespace check (dist/tools/whitespacecheck/check.sh) all the trailing white space had to be removed. Please take this into account when comparing to the original ASF distribution.

find include/ -name '*.h' -exec sed -i 's/\s*$//' '{}' +

LITTLE_ENDIAN

These include files define LITTLE_ENDIAN. But we think this is wrong. It seems more logical to let the compiler decide in which mode the ARM code is to be translated. In include/machine/endian.h there is already a define of LITTLE_ENDIAN (and BIG_ENDIAN) for a different purpose.

So, we decided to remove the define from the ASF CMSIS files. The command for it (running from this directory) is:

find include/ -name '*.h' -exec sed -i '/^#define\s\s*LITTLE_ENDIAN/d' '{}' +