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Payload length of the get dram mapping information message is 0.
The mbx_mem->len parameter should be 4, it only contains
message header.

Fixes: b67d2029

 ("plat/synquacer: enable SCMI support")
Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>
Change-Id: If1cd4c855da2dc5dc4b6da3bea152b8441971de7

Enable the SCMI protocol support in SynQuacer platform.
Aside from power domain, system power and apcore management protocol,
this commit adds the vendor specific protocol(0x80).
This vendor specific protocol is used to get the dram mapping information
from SCP.
Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>