mfd: lpc_sch: Don't call mfd_remove_devices()

MFD core already cares about failing registration. It will remove successfully
registered devices in case of error. Thus, no need to repeatedly call
mfd_remove_devices().

Fixes: 5829e9b6 (mfd: lpc_sch: Accomodate partial population of the MFD devices)
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>