Kconfig: hide useless options on ARM.

Those options have no effect or lead to compile error on ARM due
to fundamental incompatibilities. Add proper "depends on" clauses
to hide them.

Change-Id: I860fbd331439c25efd8aa92023195fda3add2e2c
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: https://review.coreboot.org/13904
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Martin Roth <martinroth@google.com>

src/drivers/sil/3114/Kconfig

@@ -1,6 +1,7 @@
 config DRIVERS_SIL_3114
 	bool "Silicon Image SIL3114"
 	default n
+	depends on PCI
 	help
 	It sets PCI class to IDE compatible native mode, allowing
 	SeaBIOS, FILO etc... to boot from it.