qcom: subsys-pil-tz: Add "reg-names" property

Add the "reg-names" property which lists the names of the bases
of the "reg" addresses. This property is required for subsystem
drivers to bring the individual subsystem out of reset.

Change-Id: Ibf18562705bea2fd5516ba9ed13c7047f3004ad3
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>