msm8660: disable CONFIG_GPIO_SX150X

  * this define was not set before the kernel rebase on 20130424
  * if enabled, this define sets up control for tricolored LED's
    and some other hardware that these phones don't have.
  * by disabling this, we clean up some i2c errors in kmsg

source: http://review.cyanogenmod.org/#/c/42893/