This adds the L2CC IPC resource and RPM devices to the IPQ8064 device
tree.

Tested on a Mikrotik RB3011.
Signed-off-by: Jonathan McDowell <noodles@earth.li>
Link: https://lore.kernel.org/r/a99eb2a27214b8f41070d7f1faec591e35666b21.1621531633.git.noodles@earth.liSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>