s390/boot: Ignore vmlinux.map

When building with CONFIG_VMLINUX_MAP=y, a decompressor vmlinux.map file
is generated in the boot directory.

Add this file to .gitignore to ensure Git does not track it.

Signed-off-by: WangYuli <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Acked-by: Vasily Gorbik <[email protected]>
Signed-off-by: Vasily Gorbik <[email protected]>

Author: Avenger-285714

arch/s390/boot/.gitignore

@@ -5,4 +5,5 @@ relocs.S
 section_cmp.*
 vmlinux
 vmlinux.lds
+vmlinux.map
 vmlinux.syms