disp: msm: sde: release splash memory using memblock_free

The splash memory initialized by the bootloader needs
to be released after the first frame update. Add
memblock_free() call to release this memory that was
reserved during the kernel boot.

Change-Id: I463139a3f930dd9284d3ba9516714ead0c77cc02
Signed-off-by: Narendra Muppalla <quic_nmuppall@quicinc.com>

msm/sde/sde_kms.c

@@ -768,6 +768,11 @@ static int _sde_kms_release_shared_buffer(unsigned int mem_addr,
 	pfn_start = mem_addr >> PAGE_SHIFT;
 	pfn_end = (mem_addr + splash_buffer_size) >> PAGE_SHIFT;
 
+	ret = memblock_free(mem_addr, splash_buffer_size);
+	if (ret) {
+		SDE_ERROR("continuous splash memory free failed:%d\n", ret);
+		return ret;
+	}
 	for (pfn_idx = pfn_start; pfn_idx < pfn_end; pfn_idx++)
 		free_reserved_page(pfn_to_page(pfn_idx));