UPSTREAM: firmware: arm_scmi: Avoid padding in sensor message structure

scmi_resp_sensor_reading_complete structure is meant to represent an
SCMI asynchronous reading complete message. The readings field with
a 64bit type forces padding and breaks reads in scmi_sensor_reading_get.

Split it in two adjacent 32bit readings_low/high subfields to avoid the
padding within the structure. Alternatively we could to mark the structure
packed.

Link: https://lore.kernel.org/r/20210628170042.34105-1-cristian.marussi@arm.com


Fixes: e2083d36 ("firmware: arm_scmi: Add SCMI v3.0 sensors timestamped reads")
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
(cherry picked from commit 187a002b)
Bug: 187129171
Signed-off-by: Connor O'Brien <connoro@google.com>
Change-Id: Iac7e24f178da3486df742a76280c3a9a85d130e7