recipes: Drop remaining md5sum checksums
We have long since obsoleted md5sum in favour of sha256sum. Drop the remaining
56 entries (which were showing many recipes hadn't been touched in a long time).
They all do have the corresponding sha256sum entries as is clear from the diff.
(From OE-Core rev: 7e4bfcc9706fa8a09f6a0004174a2c3b21c90df3)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>