ARM: defconfig: cleanup orphaned CONFIGs

Drop CONFIG_ARCH_MSM8X60 and CONFIG_ARCH_MSM8960 which were removed in
commit 99497df5 ("ARM: qcom: merge remaining subplatforms into sensible
Kconfig entry").

Drop CONFIG_ARCH_MSM8916 and CONFIG_ARCH_MSM8974 which were removed in
commit 85148df3 ("ARM: qcom: drop most of 32-bit ARCH_QCOM subtypes").

Signed-off-by: Trevor Woerner <twoerner@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250819231652.15938-1-twoerner@gmail.com


Signed-off-by: Bjorn Andersson <andersson@kernel.org>