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: I2633305528b1767b87273d027b8a939da0cedfc4
Signed-off-by: Chandan Uddaraju <chandanu@codeaurora.org>

msm/sde/sde_kms.c

@@ -24,6 +24,7 @@
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/dma-buf.h>
+#include <linux/memblock.h>
 #include <drm/drm_atomic_uapi.h>
 #include <drm/drm_probe_helper.h>
 
@@ -817,6 +818,7 @@ static int _sde_kms_release_splash_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;