rename ROCK Pi S device tree and defconfig

Signed-off-by: Stephen <[email protected]>

fix an issue where uart1 and uart2 could not be used at the same time

Signed-off-by: Stephen <[email protected]>

organize rockpi-s-rk3308_defconfig with savedefconfig

Signed-off-by: Stephen <[email protected]>

Macaddr derived from cpuid for RK3308

(cherry picked from commit 9f82c72)
Signed-off-by: Stephen <[email protected]>

Release 20190730

Modify rockpis devtree overlay bus priority

Signed-off-by: Stephen <[email protected]>

It is for released system image rockpi4b-ubuntu-bionic-minimal-201901…

…04_2101-gpt.img

Prepare v2018.05-rc1

Prepare v2018.03

Prepare v2018.03-rc4