drm/amdgpu/smu11: fix warning on 32bit arches

Fixes
warning: cast from pointer to integer of different size
[-Wpointer-to-int-cast]
on 32 bit platforms.

Reviewed-by: Tao Zhou <tao.zhou1@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/smu_v11_0.c

@@ -527,7 +527,7 @@ static int smu_v11_0_notify_memory_pool_location(struct smu_context *smu)
 	if (memory_pool->size == 0 || memory_pool->cpu_addr == NULL)
 		return ret;
 
-	address = (uint64_t)memory_pool->cpu_addr;
+	address = (uintptr_t)memory_pool->cpu_addr;
 	address_high = (uint32_t)upper_32_bits(address);
 	address_low  = (uint32_t)lower_32_bits(address);