msm: spm: Disable Qchannel and SPM legacy mode when A57 rail is turned on

When the A57 rail is turned on at the A57 l2, set qchannel to be ignored
and disable spm legacy mode.

Change-Id: I7b9813394273f7bedc323e0d7539bd4b88dba384
Signed-off-by: Karthik Parsha <kparsha@codeaurora.org>