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>
12 files changed