firmware: Add support for querying msmc memory

DMSC can use certain amount of msmc memory available in the
system. Also certain part of msmc memory can be marked as L3
cache using board config. But users might not know what size
is being used and the remaining available msmc memory. In order
to fix this TISCI protocol provides a messages that can query
the available msmc memory in the system. Add support for this
message.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>

include/linux/soc/ti/ti_sci_protocol.h

@@ -242,9 +242,13 @@ struct ti_sci_rm_core_ops {
  * @reboot_device: Reboot the SoC
  *		Returns 0 for successful request(ideally should never return),
  *		else returns corresponding error value.
+ * @query_msmc: Query the size of available msmc
+ *		Return 0 for successful query else appropriate error value.
  */
 struct ti_sci_core_ops {
 	int (*reboot_device)(const struct ti_sci_handle *handle);
+	int (*query_msmc)(const struct ti_sci_handle *handle,
+			  u64 *msmc_start, u64 *msmc_end);
 };
 
 /**