Rename SystemUIComposeCore to PlatformComposeCore (1/2)

This CL renames the SystemUIComposeCore library to PlatformComposeCore
and moves all com.android.systemui.compose.* files to
com.android.compose.

The files will still be in
frameworks/base/packages/SystemUI/compose/core/ after this CL, and I
will move them in a follow-up CL.

Bug: 263851158
Test: Builds & presubmits
Change-Id: I31776ae19de7f64f7697f3b4af55f2d97c3fc733
diff --git a/packages/SystemUI/compose/features/Android.bp b/packages/SystemUI/compose/features/Android.bp
index 4533330..8f8bb1b 100644
--- a/packages/SystemUI/compose/features/Android.bp
+++ b/packages/SystemUI/compose/features/Android.bp
@@ -31,7 +31,7 @@
 
     static_libs: [
         "SystemUI-core",
-        "SystemUIComposeCore",
+        "PlatformComposeCore",
 
         "androidx.compose.runtime_runtime",
         "androidx.compose.material3_material3",