Revert "lmb: Default to not-LMB_USE_MAX_REGIONS"

As explained by Philippe Schenker, I was misinterpreting what happened
in the case where we do not set LMB_USE_MAX_REGIONS and so had
re-introduced the problem I was attempting to more widely resolve.

This reverts commit 007ae5d108a37564905ea1588cb279f3a522cc3d.

Reported-by: Philippe Schenker <philippe.schenker@toradex.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/lib/Kconfig b/lib/Kconfig
index 59e4304..549bd35 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -1028,6 +1028,7 @@
 config LMB_USE_MAX_REGIONS
 	bool "Use a common number of memory and reserved regions in lmb lib"
 	depends on LMB
+	default y
 	help
 	  Define the number of supported memory regions in the library logical
 	  memory blocks.