mmc: tmio: remove useless TMIO_MASK_CMD handling in tmio_mmc_host_probe()

TMIO_MASK_CMD is properly enabled in tmio_mmc_start_command().

We have no reason to set it up in tmio_mmc_host_probe().  (If we
really wanted to set it in the probe, we would have to do likewise
when resuming.)

Even worse, the following code is extremely confusing:

  _host->sdcard_irq_mask &= ~irq_mask;

The logic is opposite between "->sdcard_irq_mask" and "irq_mask".
The intention is not clear at a glance.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/tmio_mmc_core.c

@@ -1195,7 +1195,6 @@ int tmio_mmc_host_probe(struct tmio_mmc_host *_host)
 	struct tmio_mmc_data *pdata = _host->pdata;
 	struct mmc_host *mmc = _host->mmc;
 	int ret;
-	u32 irq_mask = TMIO_MASK_CMD;
 
 	/*
 	 * Check the sanity of mmc->f_min to prevent tmio_mmc_set_clock() from
@@ -1277,8 +1276,6 @@ int tmio_mmc_host_probe(struct tmio_mmc_host *_host)
 	_host->sdcard_irq_mask = sd_ctrl_read16_and_16_as_32(_host, CTL_IRQ_MASK);
 	tmio_mmc_disable_mmc_irqs(_host, TMIO_MASK_ALL);
 
-	_host->sdcard_irq_mask &= ~irq_mask;
-
 	if (_host->native_hotplug)
 		tmio_mmc_enable_mmc_irqs(_host,
 				TMIO_STAT_CARD_REMOVE | TMIO_STAT_CARD_INSERT);