bootstage: Add support for TPL record count

If bootstage is enabled in TPL it lacks a record count and so does not
build. Fix this by adding a new Kconfig option.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/Kconfig b/common/Kconfig
index af66496..4865a4d 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -69,6 +69,13 @@
 	  This is the size of the bootstage record list and is the maximum
 	  number of bootstage records that can be recorded.
 
+config TPL_BOOTSTAGE_RECORD_COUNT
+	int "Number of boot stage records to store for TPL"
+	default 5
+	help
+	  This is the size of the bootstage record list and is the maximum
+	  number of bootstage records that can be recorded.
+
 config BOOTSTAGE_FDT
 	bool "Store boot timing information in the OS device tree"
 	depends on BOOTSTAGE