powerpc/configs: Re-enable ISO9660_FS as a built-in in 64 bit configs

It turns out cloud-config uses ISO9660 filesystems to inject
configuration data into cloud images. The cloud-config failures when
ISO9660_FS is not enabled are cryptic, and building it in makes
mainline testing easier, so re-enable it.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/configs/powernv_defconfig

@@ -261,7 +261,7 @@ CONFIG_NILFS2_FS=m
 CONFIG_AUTOFS4_FS=m
 CONFIG_FUSE_FS=m
 CONFIG_OVERLAY_FS=m
-CONFIG_ISO9660_FS=m
+CONFIG_ISO9660_FS=y
 CONFIG_UDF_FS=m
 CONFIG_MSDOS_FS=y
 CONFIG_VFAT_FS=m

arch/powerpc/configs/ppc64_defconfig

@@ -291,7 +291,7 @@ CONFIG_NILFS2_FS=m
 CONFIG_AUTOFS4_FS=m
 CONFIG_FUSE_FS=m
 CONFIG_OVERLAY_FS=m
-CONFIG_ISO9660_FS=m
+CONFIG_ISO9660_FS=y
 CONFIG_UDF_FS=m
 CONFIG_MSDOS_FS=y
 CONFIG_VFAT_FS=m

arch/powerpc/configs/pseries_defconfig

@@ -259,7 +259,7 @@ CONFIG_NILFS2_FS=m
 CONFIG_AUTOFS4_FS=m
 CONFIG_FUSE_FS=m
 CONFIG_OVERLAY_FS=m
-CONFIG_ISO9660_FS=m
+CONFIG_ISO9660_FS=y
 CONFIG_UDF_FS=m
 CONFIG_MSDOS_FS=y
 CONFIG_VFAT_FS=m