Revert "ARM: dts: msm: disable L1 and L1ss for PCIe on msmcobalt"

This reverts commit c93b93ee ("ARM: dts: msm: disable L1 and
L1ss for PCIe on msmcobalt").

Re-enable a necessary power saving feature for PCIe and its
client.

Change-Id: I231f518b701a988ab4a4f475e7e3c6f17d58187b
Signed-off-by: Tony Truong <truong@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>