linux: add bzImage support for IBM s390x and Z arch

Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

linux/Config.in

@@ -226,7 +226,7 @@ config BR2_LINUX_KERNEL_APPENDED_UIMAGE
 
 config BR2_LINUX_KERNEL_BZIMAGE
 	bool "bzImage"
-	depends on BR2_i386 || BR2_x86_64
+	depends on BR2_i386 || BR2_x86_64 || BR2_s390x
 
 config BR2_LINUX_KERNEL_ZIMAGE
 	bool "zImage"