frdm_k64f: hexiwear_k64: Fix basic blinky sample

The basic blinky sample expects LED0_GPIO_PORT and LED0_GPIO_PIN macros
to be defined by board.h. The frdm_k64f and hexiwear_k64 boards don't
have a physical LED with this name, so create an alias to the green LED
to make the sample work.

Change-Id: I3426c571bb2e3165dbd9f4372d863b474c35fd5c
Signed-off-by: Maureen Helm <maureen.helm@nxp.com>
2 files changed