rockchip: Remove rejected files with .rej suffix

Probably output of incorrect applying introduced by

"rockchip: defconfig: Clean the unused pinctrl config"
(sha1: 2ec3d25f)

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>