mmc: sdhci-esdhc-imx: set back the burst_length_enable bit to 1
mmc: sdhci-esdhc-imx: set back the burst_length_enable bit to 1

Currently we find that if a usdhc is choosed to boot system, then ROM
code will set the burst length enable bit of this usdhc as 0.

This will make performance drop a lot if this usdhc's burst length is
configed. So this patch set back the burst_length_enable bit as 1,
which is the default value, and means burst length is enabled for INCR.

Signed-off-by: Haibo Chen <fde4dbe362970480ad623a8c2fd8973a70946242@freescale.com>
Acked-by: Dong Aisheng <2b078277ee35da55cb781a09fbe3a1f3f85cc310@freescale.com>
Signed-off-by: Ulf Hansson <fe47b31f388f85ce6ddf64bf3a0cf6b46077d0e6@linaro.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs