Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Set the ram of flavor to 1024

    The setting of hw:mem_page_size=large indicates larger page sizes
    for guest RAM, eg., either 2MB or 1GB on x86.
    When tested on compass, 1GB is required

    Change-Id: I22d2fcab190e465dd1c36bc4264c75c724c6f64d
    Signed-off-by: Linda Wang <wangwulin@huawei.com>

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index e2f708a..f4bf5f9 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit e2f708a2527816a845ca1048f5ad5c58fdb506e0
+Subproject commit f4bf5f90437db30ee44013414810054624b73359