sepolicy: Add context for rpmb device node.

Add context of mmcblk0rpmb device node.
(Permission are already available for
this context in qseecomd sepolicy file).

Test:
1) Bootup validation
2) AVC denial validation regarding rpmb in qseecomd

Change-Id: Id7f35e3162b546e3f215f3b4d9f7a2e17e1aee6d
1 file changed
tree: eeddf53aeae266cb179709319c2c557965d63f26
  1. generic/
  2. qva/
  3. SEPolicy.mk