i.MX6 USDHC: Use the ESDHC clock

The commit "i.mx: fsl_esdhc: add the i.mx6q support" (4692708d) introduces
support for the i.MX6Q MMC host controller USDHC.

MXC_IPG_PERCLK sets the clock to 66MHz. This seems to be the default clock
of the ESDHC IP found in < i.MX6 silicon. However, the default clock for the USDHC
IP found in i.MX6 is 200MHz (MXC_ESDHC_CLK). This difference will cause a 3 times
higher clock on SD_CLK than expected (see fsl_esdh.c -> set_sysctl()).

Signed-off-by: Michael Langer <michael.langer@de.bosch.com>
CC: Stefano Babic <sbabic@denx.de>
CC: Jason Liu <r64343@freescale.com>
Acked-by: Stefano Babic <sbabic@denx.de>

arch/arm/cpu/armv7/imx-common/speed.c

@@ -35,7 +35,11 @@ DECLARE_GLOBAL_DATA_PTR;
 int get_clocks(void)
 {
 #ifdef CONFIG_FSL_ESDHC
+#ifdef CONFIG_FSL_USDHC
+	gd->sdhc_clk = mxc_get_clock(MXC_ESDHC_CLK);
+#else
 	gd->sdhc_clk = mxc_get_clock(MXC_IPG_PERCLK);
+#endif
 #endif
 	return 0;
 }