libsnapshot: static link libselinux

libsnapshot_init is linked by microdroid. Adding libselinux as whole_static_libs in `libsnapshot_defaults` will bloat the super image of microdroid.

Instead, statically link libselinux for libsnapshot_init.

On Pixel 7 Pro:

Microdroid super image: 47173836
Baseline (Without this change): 47161548

Bug: 362839899
Test: Build, verify microdroid super image size.
Change-Id: I3c589097173b305c1d39af9edbfb8c5e29f21410
Signed-off-by: Akilesh Kailash <akailash@google.com>

fs_mgr/libsnapshot/Android.bp

@@ -46,7 +46,6 @@ cc_defaults {
         "libfstab",
         "libsnapuserd_client",
         "libz",
-        "libselinux",
     ],
     header_libs: [
         "libfiemap_headers",
@@ -112,6 +111,9 @@ cc_library_static {
     static_libs: [
         "libfs_mgr_binder",
     ],
+    whole_static_libs: [
+        "libselinux",
+    ],
 }
 
 cc_library {
@@ -130,6 +132,9 @@ cc_library {
     static_libs: [
         "libsnapshot_cow",
     ],
+    whole_static_libs: [
+        "libselinux",
+    ],
 }
 
 cc_library_static {
@@ -144,6 +149,7 @@ cc_library_static {
     ],
     static_libs: [
         "libfs_mgr",
+        "libselinux",
     ],
 }
 
@@ -161,6 +167,9 @@ cc_library_static {
     static_libs: [
         "libfs_mgr",
     ],
+    whole_static_libs: [
+        "libselinux",
+    ],
 }
 
 cc_defaults {
@@ -243,6 +252,7 @@ cc_library_static {
         "libfs_mgr",
         "libgmock",
         "libgtest",
+        "libselinux",
     ],
 }