mfd: Remove unneeded 'fast_io' parameter in regmap_config

When using MMIO with regmap, fast_io is implied. No need to set it
again.

Signed-off-by: Wolfram Sang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Lee Jones <[e-mail]>

drivers/mfd/exynos-lpass.c

···
 	.reg_stride	= 4,
 	.val_bits	= 32,
 	.max_register	= 0xfc,
-	.fast_io	= true,
 };
 
 static void exynos_lpass_disable_lpass(void *data)

drivers/mfd/fsl-imx25-tsadc.c

···
 #include <linux/regmap.h>
 
 static const struct regmap_config mx25_tsadc_regmap_config = {
-	.fast_io = true,
 	.max_register = 8,
 	.reg_bits = 32,
 	.val_bits = 32,

drivers/mfd/stm32-lptimer.c

···
 	.val_bits = 32,
 	.reg_stride = sizeof(u32),
 	.max_register = STM32_LPTIM_MAX_REGISTER,
-	.fast_io = true,
 };
 
 static int stm32_lptimer_detect_encoder(struct stm32_lptimer *ddata)

drivers/mfd/sun4i-gpadc.c

···
 	.reg_bits = 32,
 	.val_bits = 32,
 	.reg_stride = 4,
-	.fast_io = true,
 };
 
 static const struct of_device_id sun4i_gpadc_of_match[] = {