arm64: dts: qcom: sc7180-trogdor: Make clamshell/detachable fragments

At a high-level, detachable Trogdors (sometimes known as Strongbads)
don't have a cros_ec keyboard, while all clamshell Trogdors (only known
as Trogdors) always have a cros_ec keyboard. Looking closer though, all
clamshells have a USB type-A connector and a hardwired USB camera. And
all detachables replace the USB camera with a MIPI based one and swap
the USB type-a connector for the detachable keyboard pogo pins.

Split the detachable and clamshell bits into different files so we can
describe these differences in one place instead of in each board that
includes sc7180-trogdor.dtsi. For now this is just the keyboard part,
but eventually this will include the type-a port and the pogo pins.

Cc: [email protected]
Cc: Bjorn Andersson <[email protected]>
Cc: Konrad Dybcio <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Krzysztof Kozlowski <[email protected]>
Cc: Conor Dooley <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: Pin-yen Lin <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>
Reviewed-by: Douglas Anderson <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Bjorn Andersson <[email protected]>

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