arm: drop eSDHC clock getting in mxc_get_clock() for layerscape

Although layerscape platforms reuse mxc_get_clock() of i.MX platforms,
eSDHC clock getting do not have to use it. It uses global data
gd->arch.sdhc_clk directly in fsl_esdhc driver. Even there are more
than one eSDHC controllers on SoC, they use same reference clock.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>

arch/arm/include/asm/arch-fsl-layerscape/clock.h

@@ -14,8 +14,6 @@ enum mxc_clock {
 	MXC_ARM_CLK = 0,
 	MXC_BUS_CLK,
 	MXC_UART_CLK,
-	MXC_ESDHC_CLK,
-	MXC_ESDHC2_CLK,
 	MXC_I2C_CLK,
 	MXC_DSPI_CLK,
 };

arch/arm/include/asm/arch-ls102xa/clock.h

@@ -12,7 +12,6 @@
 enum mxc_clock {
 	MXC_ARM_CLK = 0,
 	MXC_UART_CLK,
-	MXC_ESDHC_CLK,
 	MXC_I2C_CLK,
 	MXC_DSPI_CLK,
 };