arm64: dts: qcom: Rename sa8775p SoC to "lemans"

arm64: dts: qcom: Rename sa8775p SoC to "lemans"

SA8775P, QCS9100 and QCS9075 are all variants of the same die,
collectively referred to as lemans. Most notably, the last of them
has the SAIL (Safety Island) fused off, but remains identical
otherwise.

In an effort to streamline the codebase, rename the SoC DTSI, moving
away from less meaningful numerical model identifiers.

Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Nacked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Wasim Nazir <wasim.nazir@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250803110113.401927-2-wasim.nazir@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>