net: msm_rmnet.h: Add sleep state extended IOCTL

Add extended IOCTL to set and reset the sleep states
of the underlying physical transport.

CRs-Fixed: 679058
Change-Id: I962e016abf3bfa4b468591039b79cef58fbb8b3b
Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>