Input: spear-keyboard - improve build coverage using COMPILE_TEST

Used to test the PM changes.
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/20221204180841.2211588-29-jic23@kernel.orgSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/keyboard/Kconfig

@@ -709,7 +709,7 @@ config KEYBOARD_OMAP4
 
 config KEYBOARD_SPEAR
 	tristate "ST SPEAR keyboard support"
-	depends on PLAT_SPEAR
+	depends on PLAT_SPEAR || COMPILE_TEST
 	select INPUT_MATRIXKMAP
 	help
 	  Say Y here if you want to use the SPEAR keyboard.