boards: nrf52_pca10040: Fix Arduino SPI pin assignment
boards: nrf52_pca10040: Fix Arduino SPI pin assignment

Moved arduino_spi to spi2
Set sck-pin in arduino_spi correctly as pin 25
Moved disabled spi0 miso pin assignment to pin 28

Signed-off-by: Nick Ward <4cc68c8347d569d338d0d8b33adf17755d79d3ff@setec.com.au>

galak/zephyr,galak/zephyr,Vudentz/zephyr,finikorg/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,galak/zephyr,Vudentz/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,nashif/zephyr,nashif/zephyr,Vudentz/zephyr,nashif/zephyr,finikorg/zephyr,nashif/zephyr,galak/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,Vudentz/zephyr