s390/purgatory: update .gitignore

Since commit 4c0f032d ("s390/purgatory: Omit use of bin2c"),
kexec-purgatory.c is not generated.

purgatory and purgatory.lds are generated files, so should be ignored
by git.
Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>

arch/s390/purgatory/.gitignore

-kexec-purgatory.c
+purgatory
+purgatory.lds
 purgatory.ro