ARC: [zebu] Remove CONFIG_INITRAMFS_SOURCE from defconfigs

Zebu boards were added in v4.9 and then renamed to "haps" in v4.10.

Thus backporting
commit 64234961c145 (ARC: configs: Remove CONFIG_INITRAMFS_SOURCE from defconfigs)
we missed "zebu" defconfigs in v4.9.

Note this is only applicable to "linux-4.9.y"!

Spotted by KerneCI, see [1].

[1] https://storage.kernelci.org/stable/linux-4.9.y/v4.9.144/arc/zebu_hs_smp_defconfig/build.log



Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>