tpl: Ensure all TPL symbols in Kconfig have some TPL dependency

Tighten up symbol dependencies in a number of places.  Ensure that a TPL
specific option has at least a direct dependency on TPL.  In places
where it's clear that we depend on something more specific, use that
dependency instead.

Reported-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/lib/Kconfig b/lib/Kconfig
index 884569f..ccbc52d 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -248,6 +248,7 @@
 
 config TPL_TINY_MEMSET
 	bool "Use a very small memset() in TPL"
+	depends on TPL
 	help
 	  The faster memset() is the arch-specific one (if available) enabled
 	  by CONFIG_USE_ARCH_MEMSET. If that is not enabled, we can still get
@@ -771,7 +772,7 @@
 
 config TPL_OF_LIBFDT_ASSUME_MASK
 	hex "Mask of conditions to assume for libfdt"
-	depends on TPL_OF_LIBFDT || FIT
+	depends on TPL_OF_LIBFDT || (FIT && TPL)
 	default 0xff
 	help
 	  Use this to change the assumptions made by libfdt in TPL about the