fsl_esdhc: Remove cache snooping for i.MX

The cache snooping feature of Freescale's eSDHC IP is not available on i.MX, so
disable it globally for this architecture. This avoids setting no_snoop for all
i.MX boards, and it prevents setting a reserved bit of a reserved register if
fsl_esdhc_mmc_init() is used on i.MX, like in
arch/arm/cpu/armv7/imx-common/cpu.c/cpu_mmc_init().

Since no_snoop was only used on i.MX, get rid of it BTW.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Cc: Andy Fleming <afleming@gmail.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Kim Phillips <kim.phillips@freescale.com>
diff --git a/board/ttcontrol/vision2/vision2.c b/board/ttcontrol/vision2/vision2.c
index d287544..f28eab0 100644
--- a/board/ttcontrol/vision2/vision2.c
+++ b/board/ttcontrol/vision2/vision2.c
@@ -521,7 +521,7 @@
 }
 
 struct fsl_esdhc_cfg esdhc_cfg[1] = {
-	{MMC_SDHC1_BASE_ADDR, 1},
+	{MMC_SDHC1_BASE_ADDR},
 };
 
 int get_mmc_getcd(u8 *cd, struct mmc *mmc)