Add API for available GPU memory

Add support for AMD Agent to return amount of memory available

Change-Id: I5c32e2cebbaa2993b044250aefe434e4cc02d8c2
Signed-off-by: David Yat Sin <david.yatsin@amd.com>

runtime/hsa-runtime/inc/hsa_ext_amd.h

@@ -318,7 +318,13 @@ typedef enum hsa_amd_agent_info_s {
    * cooperative dispatch.
    * The type of this attribute is uint32_t.
    */
-  HSA_AMD_AGENT_INFO_COOPERATIVE_COMPUTE_UNIT_COUNT = 0xA014
+  HSA_AMD_AGENT_INFO_COOPERATIVE_COMPUTE_UNIT_COUNT = 0xA014,
+  /**
+   * Queries the amount of memory available in bytes accross all global pools
+   * owned by the agent.
+   * The type of this attribute is uint64_t.
+   */
+  HSA_AMD_AGENT_INFO_MEMORY_AVAIL = 0xA015
 } hsa_amd_agent_info_t;
 
 typedef struct hsa_amd_hdp_flush_s {