platform/chrome: cros_ec_proto: add Kunit test for getting cmd mask error

cros_ec_query_all() uses cros_ec_get_host_command_version_mask() to
query the supported MKBP version; cros_ec_get_host_command_version_mask()
uses send_command() for transferring the host command.

Returning >=0 from send_command() only denotes the transfer was success.
cros_ec_get_host_command_version_mask() should check if EC wasn't happy
by checking `msg->result`.

Add a Kunit test for returning error in `msg->result` in
cros_ec_get_host_command_version_mask().  For the case,
cros_ec_query_all() should find the EC device doesn't support MKBP.

Reviewed-by: Guenter Roeck <[email protected]>
Signed-off-by: Tzung-Bi Shih <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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