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

Change-Id: I50ba7c95e50eb7e7d63cb2bf2f8a61468be8fcfe