BACKPORT: FROMLIST: firmware: arm_scmi: set mailbox timeout value from device tree

Each platform might have its own maximum mailbox receive channel timeout
value, so get property max-rx-timeout-ms from device tree and use it. If
the property does not exist, use mailbox 'scmi_desc' fixed value 30ms as
before.

Signed-off-by: Peng Fan <peng.fan@nxp.com>

Bug: 364340026
Link: https://lore.kernel.org/arm-scmi/20240709140957.3171255-2-peng.fan@oss.nxp.com/


Change-Id: If1698ecdf92f2544f126670c552c24c74597c670
Signed-off-by: Zhipeng Wang <zhipeng.wang_1@nxp.com>