ARM: dts: qcom: msm8226: Add ocmem

Add a node for the ocmem found on msm8226. It contains one region, used
as gmu_ram.

Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Link: https://lore.kernel.org/r/20230506-msm8226-ocmem-v3-6-79da95a2581f@z3ntu.xyz


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