ARM: dts: qcom: msm8226: Add ADSP node

Add a node for the adsp found on msm8226.

Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220423155059.660387-3-luca@z3ntu.xyz