linux: mali_memory_os_alloc: Remove __GFP_COLD

The support for Cache hot and cold pages are removed from the kernel.
For more information refer kernel commit 453f85d

Link: https://github.com/Xilinx/meta-xilinx/tree/rel-v2020.1/meta-xilinx-bsp/recipes-graphics/mali/kernel-module-mali
Signed-off-by: Madhurkiran Harikrishnan <madhurkiran.harikrishnan@xilinx.com>
Reviewed-by: Hyun Kwon <hyun.kwon@xilinx.com>
Upstream Status: Pending
Signed-off-by: Shane Lin <shane.lin@canonical.com>
Signed-off-by: Wen-chien Jesse Sung <jesse.sung@canonical.com>

Author: Madhurkiran Harikrishnan

ubuntu/mali/linux/mali_memory_os_alloc.c

@@ -202,7 +202,9 @@ int mali_mem_os_alloc_pages(mali_mem_os_mem *os_mem, u32 size)
 	/* Allocate new pages, if needed. */
 	for (i = 0; i < remaining; i++) {
 		dma_addr_t dma_addr;
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 14, 0)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0)
+		gfp_t flags = __GFP_ZERO | __GFP_RETRY_MAYFAIL | __GFP_NOWARN;
+#elif LINUX_VERSION_CODE == KERNEL_VERSION(4, 14, 0)
 		gfp_t flags = __GFP_ZERO | __GFP_RETRY_MAYFAIL | __GFP_NOWARN | __GFP_COLD;
 #else
 		gfp_t flags = __GFP_ZERO | __GFP_REPEAT | __GFP_NOWARN | __GFP_COLD;