tree/: Rename 'laptop_ok-> g_laptop_ok' to avoid shadowing

Avoid global symbol shadowing in local functions.

Change-Id: Idfca0b7e46d8051bf680227250cf40483e19dc53
Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/73646
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Sam McNally <sammc@google.com>

board_enable.c

@@ -2293,7 +2293,7 @@ static int p2_not_a_laptop(void)
 static int p2_whitelist_laptop(void)
 {
 	is_laptop = 1;
-	laptop_ok = true;
+	g_laptop_ok = true;
 	msg_pdbg("Whitelisted laptop detected.\n");
 	return 0;
 }