Rename generic_system_image to aosp_shared_system_image

To avoid confusion with the GSI, rename the generic_system_image to
aosp_shared_system_image.

Bug: 378572528
Test: TH
Change-Id: I9aee7d9a0404271997865da88ff7eef9e417c4a9
diff --git a/fsgen/filesystem_creator.go b/fsgen/filesystem_creator.go
index c74579a..8a41524 100644
--- a/fsgen/filesystem_creator.go
+++ b/fsgen/filesystem_creator.go
@@ -146,7 +146,7 @@
 		fsProps.Build_logtags = proptools.BoolPtr(true)
 		// https://source.corp.google.com/h/googleplex-android/platform/build//639d79f5012a6542ab1f733b0697db45761ab0f3:core/packaging/flags.mk;l=21;drc=5ba8a8b77507f93aa48cc61c5ba3f31a4d0cbf37;bpv=1;bpt=0
 		fsProps.Gen_aconfig_flags_pb = proptools.BoolPtr(true)
-		// Identical to that of the generic_system_image
+		// Identical to that of the aosp_shared_system_image
 		fsProps.Fsverity.Inputs = []string{
 			"etc/boot-image.prof",
 			"etc/dirty-image-objects",