lantiq: enable retrieving kernel args from bootloader

This patch is a device tree enhancement that IMHO is worthy of mainline.
It allows the bootloader's commandline to be preserved even when the
device tree specifies one.

Signed-off-by: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36780 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/generic/patches-3.10/997-device_tree_cmdline.patch

+--- a/drivers/of/fdt.c
++++ b/drivers/of/fdt.c
+@@ -677,6 +677,9 @@ int __init early_init_dt_scan_chosen(uns
+ 	p = of_get_flat_dt_prop(node, "bootargs", &l);
+ 	if (p != NULL && l > 0)
+ 		strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
++	p = of_get_flat_dt_prop(node, "bootargs-append", &l);
++	if (p != NULL && l > 0)
++		strlcat(data, p, min(strlen(data) + (int)l, COMMAND_LINE_SIZE));
+ 
+ 	/*
+ 	 * CONFIG_CMDLINE is meant to be a default in case nothing else

target/linux/generic/patches-3.8/997-device_tree_cmdline.patch

+--- a/drivers/of/fdt.c
++++ b/drivers/of/fdt.c
+@@ -677,6 +677,9 @@ int __init early_init_dt_scan_chosen(uns
+ 	p = of_get_flat_dt_prop(node, "bootargs", &l);
+ 	if (p != NULL && l > 0)
+ 		strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
++	p = of_get_flat_dt_prop(node, "bootargs-append", &l);
++	if (p != NULL && l > 0)
++		strlcat(data, p, min(strlen(data) + (int)l, COMMAND_LINE_SIZE));
+ 
+ 	/*
+ 	 * CONFIG_CMDLINE is meant to be a default in case nothing else

target/linux/generic/patches-3.9/997-device_tree_cmdline.patch

+--- a/drivers/of/fdt.c
++++ b/drivers/of/fdt.c
+@@ -677,6 +677,9 @@ int __init early_init_dt_scan_chosen(uns
+ 	p = of_get_flat_dt_prop(node, "bootargs", &l);
+ 	if (p != NULL && l > 0)
+ 		strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
++	p = of_get_flat_dt_prop(node, "bootargs-append", &l);
++	if (p != NULL && l > 0)
++		strlcat(data, p, min(strlen(data) + (int)l, COMMAND_LINE_SIZE));
+ 
+ 	/*
+ 	 * CONFIG_CMDLINE is meant to be a default in case nothing else