rockchip: rk3368: grf: use shifted-constants

The RK3368 GRF header was still defines with a shifted-mask but with
non-shifted function selectors for the IOMUX defines.  As the RK3368
support is still fresh enough to allow a quick change, we do this now
before having more code use this.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
diff --git a/drivers/pinctrl/rockchip/pinctrl_rk3368.c b/drivers/pinctrl/rockchip/pinctrl_rk3368.c
index bdf0758..c96459f 100644
--- a/drivers/pinctrl/rockchip/pinctrl_rk3368.c
+++ b/drivers/pinctrl/rockchip/pinctrl_rk3368.c
@@ -31,8 +31,7 @@
 	case PERIPH_ID_UART2:
 		rk_clrsetreg(&grf->gpio2a_iomux,
 			     GPIO2A6_MASK | GPIO2A5_MASK,
-			     GPIO2A6_UART2_SIN << GPIO2A6_SHIFT |
-			     GPIO2A5_UART2_SOUT << GPIO2A5_SHIFT);
+			     GPIO2A6_UART2_SIN | GPIO2A5_UART2_SOUT);
 		break;
 	case PERIPH_ID_UART0:
 		break;
@@ -44,10 +43,8 @@
 		rk_clrsetreg(&pmugrf->gpio0d_iomux,
 			     GPIO0D0_MASK | GPIO0D1_MASK |
 			     GPIO0D2_MASK | GPIO0D3_MASK,
-			     GPIO0D0_GPIO << GPIO0D0_SHIFT |
-			     GPIO0D1_GPIO << GPIO0D1_SHIFT |
-			     GPIO0D2_UART4_SOUT << GPIO0D2_SHIFT |
-			     GPIO0D3_UART4_SIN << GPIO0D3_SHIFT);
+			     GPIO0D0_GPIO | GPIO0D1_GPIO |
+			     GPIO0D2_UART4_SOUT | GPIO0D3_UART4_SIN);
 		break;
 	default:
 		debug("uart id = %d iomux error!\n", uart_id);