Updates kvmx: 48977cf Feat: TRIM support using image_discards option

diff --git a/kvmx b/kvmx
index e1a1bd36c6df22ae9c2af75cf07cbd940e824733..48977cf4c193acbc2e57f2c6a34269faf4723b75 160000 (submodule)
--- a/kvmx
+++ b/kvmx
@@ -1 +1 @@
-Subproject commit e1a1bd36c6df22ae9c2af75cf07cbd940e824733
+Subproject commit 48977cf4c193acbc2e57f2c6a34269faf4723b75