qseecom: add integer overflow protection and support to set multiple PIPEs

Add integer overflow protection for qclk->clk_access_cnt;
TZ changes their implementation to support one quest to set
multiple PIPE registers.We use mode operation to indicate
multiple PIPE registers in qseecom set key request.

Change-Id: I216dfdf73a6ecef633e0f5846d65d0648d2d451e
Signed-off-by: Zhen Kong <zkong@codeaurora.org>