rpmsg: glink: Use the intents passed by remote

While sending data, use the remote intent id buffer
of suitable size that was passed by remote previously.

Change-Id: I946d231ababecf54c93865a76fa9f1204519e657
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>