cnss2: set rddm support boolean for MHI

Set the RDDM support boolean at power up for MHI to know that the
device can enter RDDM execution environment. It can decide to skip
SYS_ERROR handling based on the boolean whereas allow other aspects
such as collection ramdumps if sufficient support is present.

Change-Id: Iee74b6ae61166ea48617e1b75f05841079e1b83b
Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>