cmd: cache: Remove weak functions

It should be up to an architecture to decide how to implement cache
functions, and if they need to use weak functions or not. Allowing the
cache command to be built without cache functionality implemented is
unhelpful. Further, guard the call to noncached_set_region with
CONFIG_SYS_NONCACHED_MEMORY as that's when it's implemented and again is
an architecture specific detail.

Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/cmd/cache.c b/cmd/cache.c
index 0254ff1..7a20682 100644
--- a/cmd/cache.c
+++ b/cmd/cache.c
@@ -13,16 +13,6 @@
 
 static int parse_argv(const char *);
 
-void __weak invalidate_icache_all(void)
-{
-	/* please define arch specific invalidate_icache_all */
-	puts("No arch specific invalidate_icache_all available!\n");
-}
-
-__weak void noncached_set_region(void)
-{
-}
-
 static int do_icache(struct cmd_tbl *cmdtp, int flag, int argc,
 		     char *const argv[])
 {
@@ -52,12 +42,6 @@
 	return 0;
 }
 
-void __weak flush_dcache_all(void)
-{
-	puts("No arch specific flush_dcache_all available!\n");
-	/* please define arch specific flush_dcache_all */
-}
-
 static int do_dcache(struct cmd_tbl *cmdtp, int flag, int argc,
 		     char *const argv[])
 {
@@ -69,7 +53,9 @@
 			break;
 		case 1:
 			dcache_enable();
+#ifdef CONFIG_SYS_NONCACHED_MEMORY
 			noncached_set_region();
+#endif
 			break;
 		case 2:
 			flush_dcache_all();