sys/linux: add some sample fscrypt keys

Add some sample keys with their precomputed fscrypt key identifiers, and
add some sample fscrypt key descriptors.

This hopefully makes it much more likely that syzkaller will generate
programs that both add an encryption key to the kernel
(FS_IOC_ADD_ENCRYPTION_KEY or add_key$fscrypt_v1) *and* create a
directory that is encrypted using that key (mkdir() +
FS_IOC_SET_ENCRYPTION_POLICY).  Doing this requires matching up the
value of the fscrypt key identifier or the fscrypt key descriptor.

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