s390: add various .gitignore files.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/boot/.gitignore

@@ -0,0 +1,2 @@
+image
+bzImage

arch/s390/boot/compressed/.gitignore

@@ -0,0 +1,3 @@
+sizes.h
+vmlinux
+vmlinux.lds

arch/s390/kernel/.gitignore

@@ -0,0 +1 @@
+vmlinux.lds

arch/s390/kernel/vdso32/.gitignore

@@ -0,0 +1 @@
+vdso32.lds

arch/s390/kernel/vdso64/.gitignore

@@ -0,0 +1 @@
+vdso64.lds