sysless: MTD SPI Flash: erase operations and corrections after testing.

Signed-off-by: Pavel Pisa <ppisa@pikron.com>

diff --git a/submodule/sysless b/submodule/sysless
index 93c60ef98210af51baa4fcb9337877d1bc49338a..70c2205350dc0c3286bddc01a6b070c6fa356756 160000 (submodule)
--- a/submodule/sysless
+++ b/submodule/sysless
@@ -1 +1 @@
-Subproject commit 93c60ef98210af51baa4fcb9337877d1bc49338a
+Subproject commit 70c2205350dc0c3286bddc01a6b070c6fa356756