drivers: soc: sdx_ext_ipc: Add option to change default policy

Current code sets default policy to PANIC. Add option
to override it from device tree.

Change-Id: I0bdfdf2fc7cebfab951bd8be91ea3d8cb4f280cd
Signed-off-by: Manohar Vavilapalli <mvavilap@codeaurora.org>
2 files changed