ARM: OMAP: Update palmte_defconfig to enable GPIO switch

Update palmte_defconfig to enable CONFIG_OMAP_GPIO_SWITCH. Else, we get

arch/arm/mach-omap1/built-in.o: In function `omap_palmte_init':
board-palmte.c:(.init.text+0xbc0): undefined reference to
`omap_register_gpio_switches'
Signed-off-by: Dirk Behme <dirk.behme@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>