soc: qcom: dcc: add support for DCC XPU lock/unlock request

Add support to request TZ to lock and unlock DCC XPU.

DCC XPU is unlocked before accessing DCC and is locked back again after
configuring DCC.

Change-Id: I8815f65551df0b80f7ecdcaa338a50db8d9b04f5
Signed-off-by: Shashank Mittal <mittals@codeaurora.org>