dt-bindings: arm: msm: Update the maintainers for LLCC

Both Rishabh and Sai have left Qualcomm, and there is no evidence of them
maintaining with a new identity. So their entry needs to be removed.

Listed Bjorn as the interim maintainer until someone volunteers to maintain
this binding.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230314080443.64635-2-manivannan.sadhasivam@linaro.org