Input: tests - modular KUnit tests should not depend on KUNIT=y

While KUnit tests that cannot be built as a loadable module must depend
on "KUNIT=y", this is not true for modular tests, where it adds an
unnecessary limitation.

Fix this by relaxing the dependency to "KUNIT".

Fixes: fdefcbdd ("Input: Add KUnit tests for some of the input core helper functions")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://lore.kernel.org/r/483c4f520e4acc6357ebba3e605977b4c56374df.1683022164.git.geert+renesas@glider.beSigned-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/Kconfig

@@ -168,7 +168,7 @@ config INPUT_EVBUG
 
 config INPUT_KUNIT_TEST
 	tristate "KUnit tests for Input" if !KUNIT_ALL_TESTS
-	depends on INPUT && KUNIT=y
+	depends on INPUT && KUNIT
 	default KUNIT_ALL_TESTS
 	help
 	  Say Y here if you want to build the KUnit tests for the input