core & tools: system_dlkm: add dynamic partition

Converts existing static partition support to a
dynamic partition.

Bug: 200082547
Test: TH
Signed-off-by: Ramji Jiyani <ramjiyani@google.com>
Change-Id: Ifd6d0c2a04e947b16f8b241e99cca594a1d315ae
diff --git a/help.sh b/help.sh
index 06a9056..e51adc1 100755
--- a/help.sh
+++ b/help.sh
@@ -52,6 +52,8 @@
                             Stands for "VendorDlkm, NO Dependencies"
     odnod                   Quickly rebuild the odm_dlkm image from built packages
                             Stands for "OdmDlkm, NO Dependencies"
+    sdnod                   Quickly rebuild the system_dlkm image from built packages
+                            Stands for "SystemDlkm, NO Dependencies"
 
 
 So, for example, you could run: