MIPS: dts: remove bogus bcm96358nb4ser.dtb from dtb-y entry

MIPS: dts: remove bogus bcm96358nb4ser.dtb from dtb-y entry

commit 3cad14d56adbf7d621fc5a35db42f3acc0a2d6e8 upstream.

arch/mips/boot/dts/brcm/bcm96358nb4ser.dts does not exist, so
we cannot build bcm96358nb4ser.dtb .

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Fixes: 695835511f96 ("MIPS: BMIPS: rename bcm96358nb4ser to bcm6358-neufbox4-sercom")
Acked-by: James Hogan <jhogan@kernel.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>