pinctrl: rockchip: rk3568: fix strength setting bug
This patch fix following pins error design:
4a7/4b7/4c7/4d7, 3a7/3b7/3c7/3d7, 2a7/2b7/2c7/2d7, 1b7/1c7/1d7
share register with:
4a6/4b6/4c6/4d6, 3a6/3b6/3c6/3d6, 2a6/2b6/2c6/2d6, 1b6/1c6/1d6
Change-Id: I66fa6b261f2bec26b75750a77a56b372282b222f
Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>