mfd: 88pm860x-i2c: Fix variable length array Sparse warning
mfd: 88pm860x-i2c: Fix variable length array Sparse warning

drivers/mfd/88pm860x-i2c.c:125:33:
  warning: Variable length array is used.

Signed-off-by: Lee Jones <630e34333487a351a857f6b705e04d30b37c1629@linaro.org>

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