ARM: dts: msm: Add the poll-delay-msec for the cache erp driver for MSM8994

The cache erp driver needs to poll the error syndrome registers
to check for single bit errors. Provide the poll delay for this purpose.

Change-Id: I0101605c8a63cf5c8309597c022abdb8c962be42
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>