This reverts commit 46af59fb8f.
The RNG driver was initially disabled because of missing clock
changes and this driver was causing boot up issues.
Now with the clock changes checked in the RNG driver works.
Change-Id: I127f25c8be6b715510c1fb16b274a814416d8a8a
Signed-off-by: Ramesh Masavarapu <rameshm@codeaurora.org>