dt-bindings: msm: Update documentation of qcom,llcc

Add reg-names and interrupts for LLCC documentation and the usage
examples. llcc broadcast base is added in addition to llcc base,
which is used for llcc broadcast writes.

Change-Id: Iedfba1e04fe619dad75333e477d50ff6746fad03
Signed-off-by: Venkata Narendra Kumar Gutta <vnkgutta@codeaurora.org>