rpmsg: core: add API to get MTU
Return the rpmsg buffer MTU for sending message, so rpmsg users can split a long message in several sub rpmsg buffers. Signed-off-by:Arnaud Pouliquen <arnaud.pouliquen@st.com> [s-anna@ti.com: cherry-pick https://patchwork.kernel.org/patch/11242365/ ] Signed-off-by:
Suman Anna <s-anna@ti.com>
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