qseecom: Validate pointer offset in qseecom_send_modfd_cmd

Validate cmd_req_buf pointer offset in qseecom_send_modfy_cmd, and
make sure cmd buffer address to be within shared bufffer.

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

Change-Id: I431511a92ab2cccbc2daebc0cf76cc3872689a97
Signed-off-by: Zhen Kong <zkong@codeaurora.org>
Signed-off-by: Vignesh Veeramani <quicvignes@codeaurora.org>
msm: Create shadow files under /sys/kernel/ipv4

The TCP delayed ack parameters can be configured from user space
application which runs with non-root credentials and does not have
direct write access to /proc entries. This commit creates shadow
files under /sys/kernel/ipv4 which maps to /proc/sys/net/ipv4.

CRs-Fixed: 628139
Change-Id: If9f5e8f1f5f31c39090555b7b0c40efcdf6ccd08
Signed-off-by: Ravi Joshi <ravij@codeaurora.org>