The 'arm,armv8' compatible string is only for software models. It adds
little value otherwise and is inconsistently used as a fallback on some
platforms. Remove it from those platforms.

This fixes warnings generated by the DT schema.
Reported-by: NMichal Simek <michal.simek@xilinx.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Acked-by: NAntoine Tenart <antoine.tenart@bootlin.com>
Acked-by: NNishanth Menon <nm@ti.com>
Acked-by: NMaxime Ripard <maxime.ripard@bootlin.com>
Acked-by: NManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Acked-by: NChanho Min <chanho.min@lge.com>
Acked-by: NKrzysztof Kozlowski <krzk@kernel.org>
Acked-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: NGregory CLEMENT <gregory.clement@bootlin.com>
Acked-by: NThierry Reding <treding@nvidia.com>
Acked-by: NHeiko Stuebner <heiko@sntech.de>
Acked-by: NSimon Horman <horms+renesas@verge.net.au>
Acked-by: NTero Kristo <t-kristo@ti.com>
Acked-by: NWei Xu <xuwei5@hisilicon.com>
Acked-by: NLiviu Dudau <liviu.dudau@arm.com>
Acked-by: NMatthias Brugger <matthias.bgg@gmail.com>
Acked-by: NMichal Simek <michal.simek@xilinx.com>
Acked-by: NScott Branden <scott.branden@broadcom.com>
Acked-by: NKevin Hilman <khilman@baylibre.com>
Acked-by: NChunyan Zhang <zhang.lyra@gmail.com>
Acked-by: NRobert Richter <rrichter@cavium.com>
Acked-by: NJisheng Zhang <Jisheng.Zhang@synaptics.com>
Acked-by: NDinh Nguyen <dinguyen@kernel.org>
Signed-off-by: NRob Herring <robh@kernel.org>
Signed-off-by: NArnd Bergmann <arnd@arndb.de>