arm64: dts: qcom: msm8992-bullhead: Fix cont_splash_mem mapping

arm64: dts: qcom: msm8992-bullhead: Fix cont_splash_mem mapping

cont_splash_mem has different memory mapping than generic from msm8994.dtsi:

[    0.000000] cma: Found cont_splash_mem@0, memory base 0x0000000003400000, size 12 MiB, limit 0xffffffffffffffff
[    0.000000] cma: CMA: reserved 12 MiB at 0x0000000003400000 for cont_splash_mem

This fixes boot.

Fixes: 976d321f32dc ("arm64: dts: qcom: msm8992: Make the DT an overlay on top of 8994")
Signed-off-by: Petr Vorel <petr.vorel@gmail.com>
Link: https://lore.kernel.org/r/20210713185734.380-3-petr.vorel@gmail.com
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>