ENGR00153651-1 ESAI: Prepare MSL support for esai/cs42888 audio codec driver

1) Add machine specific code for esai/cs42888 driver support, including pad
    control, clk setting, i2c setting, etc.
2) Enable audio support in default config.

Signed-off-by: Lionel Xu <R63889@freescale.com>
diff --git a/arch/arm/mach-mx6/Kconfig b/arch/arm/mach-mx6/Kconfig
index 5619c7e..e0c247b 100644
--- a/arch/arm/mach-mx6/Kconfig
+++ b/arch/arm/mach-mx6/Kconfig
@@ -30,6 +30,7 @@
 	select IMX_HAVE_PLATFORM_IMX_I2C
 	select IMX_HAVE_PLATFORM_VIV_GPU
 	select IMX_HAVE_PLATFORM_IMX_VPU
+	select IMX_HAVE_PLATFORM_IMX_ESAI
 	select IMX_HAVE_PLATFORM_IMX_ANATOP_THERMAL
 	select IMX_HAVE_PLATFORM_FSL_USB2_UDC
 	select IMX_HAVE_PLATFORM_MXC_EHCI