mfd: tps65912: Convert to managed resources for allocating memory

Saves on code and simplifies the driver, as these resources are now
tracked and freed automatically when the driver is realised.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --cc drivers/mfd/tps65912-core.c
Simple merge

diff --cc drivers/mfd/tps65912-i2c.c
Simple merge

diff --cc drivers/mfd/tps65912-spi.c
Simple merge