dt-bindings: msm: Couple of spelling fixes

s/Subsytem/Subsystem/
s/contoller/controller/

Signed-off-by: Bhaskar Chowdhury <unixbhaskar@gmail.com>
Link: https://lore.kernel.org/r/20210320192553.29922-1-unixbhaskar@gmail.com


Signed-off-by: Rob Herring <robh@kernel.org>