msm: APRv2: Add APRv2 support

The MSM platforms that turn off LPASS core by default have to bring up
LPASS core prior to talk with it.
Current implementation is during bootup, before the slimbus slave device
is up, the slimbus master on apps would try to configure the slimbus
hardware.
Add APRv2 driver to let adsp loader to bring up LPASS core on and make
slimbus driver to configure hardware after bringing up LPASS core.

Change-Id: I9c45e229e6e4c5c142d8a327509d66d9662b52d4
Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org>