16k: soong: Update DevicePageSizeAgnostic to DeviceNoBionicPageSizeMacro

This is part of a larger change to update the flag
PRODUCT_PAGE_SIZE_AGNOSTIC to PRODUCT_NO_BIONIC_PAGE_SIZE_MACRO.
This is to help clarify that this flag doesn't mean the device
will actually work end-to-end with any page size.

Bug: 312541564
Test:
```
source build/envsetup.sh
lunch aosp_cf_arm64_phone_pgagnostic-trunk-userdebug
m
cat out/soong/build.aosp_cf_arm64_phone_pgagnostic.ninja | grep __BIONIC_NO_PAGE_SIZE_MACRO
```

Change-Id: I33033876d0d4a276d1bb962d40315b71a3968c66
diff --git a/cc/config/arm64_device.go b/cc/config/arm64_device.go
index 12722a7..82beb29 100644
--- a/cc/config/arm64_device.go
+++ b/cc/config/arm64_device.go
@@ -103,7 +103,7 @@
 	exportedVars.ExportStringList("Arm64Cflags", arm64Cflags)
 	pctx.VariableFunc("Arm64Cflags", func(ctx android.PackageVarContext) string {
 		flags := arm64Cflags
-		if ctx.Config().PageSizeAgnostic() {
+		if ctx.Config().NoBionicPageSizeMacro() {
 			flags = append(flags, "-D__BIONIC_NO_PAGE_SIZE_MACRO")
 		}
 		return strings.Join(flags, " ")