pinctrl/rockchip: Use temporary variable for struct device

[ Upstream commit e4dd7fd ]

Use temporary variable for struct device to make code neater.

Signed-off-by: Andy Shevchenko <[email protected]>
Reviewed-by: Heiko Stuebner <[email protected]>
Stable-dep-of: 31b62a9 ("pinctrl: rockchip: fix reading pull type on rk3568")
Signed-off-by: Sasha Levin <[email protected]>

Author: andy-shev