frdm_k64f: Fix basic button sample

The basic button sample expects SW0_GPIO_NAME and SW0_GPIO_PIN macros to
be defined by board.h. The frdm_64f doesn't have a physical switch with
this name, so create an alias to SW3 to make the sample work.

Change-Id: I61eb096582d9898dbcb9799e69078ad0c4b700cf
Signed-off-by: Maureen Helm <maureen.helm@nxp.com>
1 file changed