Platform: OLPC: Add INPUT dependencies

Building with CONFIG_INPUT set to m:

drivers/platform/olpc/olpc-xo175-ec.o: In function `olpc_xo175_ec_complete':
olpc-xo175-ec.c:(.text+0x75d): undefined reference to `input_event'
olpc-xo175-ec.c:(.text+0x76f): undefined reference to `input_event'
olpc-xo175-ec.c:(.text+0x787): undefined reference to `input_event'
olpc-xo175-ec.c:(.text+0x799): undefined reference to `input_event'
drivers/platform/olpc/olpc-xo175-ec.o: In function `olpc_xo175_ec_probe':
olpc-xo175-ec.c:(.text+0x8d5): undefined reference to `devm_input_allocate_device'
olpc-xo175-ec.c:(.text+0x910): undefined reference to `input_set_capability'
olpc-xo175-ec.c:(.text+0x91c): undefined reference to `input_register_device'

This patch add INPUT dependencies to fix this.
Reported-by: Hulk Robot <hulkci@huawei.com>
Fixes: 0c3d931b ("Platform: OLPC: Add XO-1.75 EC driver")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

drivers/platform/olpc/Kconfig

@@ -6,6 +6,7 @@ config OLPC_XO175_EC
 	tristate "OLPC XO 1.75 Embedded Controller"
 	depends on ARCH_MMP || COMPILE_TEST
 	depends on SPI_SLAVE
+	depends on INPUT
 	select OLPC_EC
 	help
 	  Include support for the OLPC XO Embedded Controller (EC). The EC