arm64: remove t186 related files

arm64: remove t186 related files

Delete following files:
./drivers/pinctrl/pinctrl-tegra186-padctl-uphy.c
./arch/arm64/boot/dts/tegra186-fpga-cl34563539.dts
./arch/arm64/boot/dts/tegra186-sim-cl34563539.dts
./arch/arm64/boot/dts/tegra186-fpga-cl34324618.dts
./arch/arm64/boot/dts/tegra186-sim-cl34324618.dts
./include/dt-bindings/memory/tegra186-swgroup.h

Bug 1748166

Change-Id: Ide593c7188c35e597e9c8efc94a8eab44a9bad57
Signed-off-by: Shreshtha SAHU <ssahu@nvidia.com>
Reviewed-on: http://git-master/r/1116938
(cherry picked from commit 1d77354b43cbe89d069995c15326abd1b9c5ff45)
Reviewed-on: http://git-master/r/1119900