kernel: export two readonly file in /proc/xiaoqiang

/proc/xiaoqiang/model is the type string of the router
/proc/xiaoqiang/reset is the gpio number of the reset switch

update the readme file

Signed-off-by: Jack Tan <jiankemeng@gmail.com>
kernel: update the default .config

The size of vmlinuz image is about 2.8MB when using this kernel
configuration file

Signed-off-by: Jack Tan <jiankemeng@gmail.com>
kernel: backup the two kernel config file in arch/arm/configs/

Signed-off-by: Jack Tan <jiankemeng@gmail.com>
kernel: add a ramfs extracted from official ROM 0.5.56

Signed-off-by: Jack Tan <jiankemeng@gmail.com>