Update Linux to v5.10.109

Sourced from [1]

[1] https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.10.109.tar.xz

Change-Id: I19bca9fc6762d4e63bcf3e4cba88bbe560d9c76c
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/arch/mips/alchemy/common/prom.c b/arch/mips/alchemy/common/prom.c
index af312b5..d910c0a 100644
--- a/arch/mips/alchemy/common/prom.c
+++ b/arch/mips/alchemy/common/prom.c
@@ -34,6 +34,9 @@
  */
 
 #include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/memblock.h>
+#include <linux/sizes.h>
 #include <linux/string.h>
 
 #include <asm/bootinfo.h>
@@ -76,6 +79,24 @@
 	return NULL;
 }
 
+void __init prom_init(void)
+{
+	unsigned char *memsize_str;
+	unsigned long memsize;
+
+	prom_argc = (int)fw_arg0;
+	prom_argv = (char **)fw_arg1;
+	prom_envp = (char **)fw_arg2;
+
+	prom_init_cmdline();
+
+	memsize_str = prom_getenv("memsize");
+	if (!memsize_str || kstrtoul(memsize_str, 0, &memsize))
+		memsize = SZ_64M; /* minimum memsize is 64MB RAM */
+
+	memblock_add(0, memsize);
+}
+
 static inline unsigned char str2hexnum(unsigned char c)
 {
 	if (c >= '0' && c <= '9')