imx-common: fix iomux settings

When setting iomux for a pin mux, there is no need to check mux_ctrl_ofs.
Also If still checking mux_ctrl_ofs, we have no chance to set iomux
for i.MX7D IOMUXC_LPSR_SW_MUX_CTL_PAD_GPIO1_IO00, because the mux_ctrl_ofs
for this register is 0.

Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Tested-by: Fabio Estevam <fabio.estevam@freescale.com>

arch/arm/imx-common/iomux-v3.c

@@ -53,8 +53,7 @@ void imx_iomux_v3_setup_pad(iomux_v3_cfg_t pad)
 	}
 #endif
 
-	if (mux_ctrl_ofs)
-		__raw_writel(mux_mode, base + mux_ctrl_ofs);
+	__raw_writel(mux_mode, base + mux_ctrl_ofs);
 
 	if (sel_input_ofs)
 		__raw_writel(sel_input, base + sel_input_ofs);