mfd: 88pm800: Enhance sub devices initialization
mfd: 88pm800: Enhance sub devices initialization

Separate the devices initialization into different functions.
It makes the probe function clearer.

Signed-off-by: Chao Xie <4e92301452ced7a9cf1e5ca194da9c30c818b2d6@marvell.com>
Signed-off-by: Samuel Ortiz <0ba86cb3f08bbb861958e54bd3438887adb4263c@linux.intel.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs