Revert "remove qrngd"

This reverts commit 35072180e3604d029cc993c1af825f0e04ae24d3.

Change-Id: I589e6fdb0b4702c8b55ca0b47b3819db128f8e7f
d2-common: update perms

/dev/rtc0 to 0660
add perms for wcnss for the stepchildren

Change-Id: Ic73a473c2086ee531ace5a54f9fe0a85c1a8523c