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/android/config.go b/android/config.go
index a9fcca5..22f17bb 100644
--- a/android/config.go
+++ b/android/config.go
@@ -195,10 +195,12 @@
 	return String(c.config.productVariables.DeviceMaxPageSizeSupported)
 }
 
-// PageSizeAgnostic returns true when AOSP is page size agnostic,
-// othersise it returns false.
-func (c Config) PageSizeAgnostic() bool {
-	return Bool(c.config.productVariables.DevicePageSizeAgnostic)
+// NoBionicPageSizeMacro returns true when AOSP is page size agnostic.
+// This means that the bionic's macro PAGE_SIZE won't be defined.
+// Returns false when AOSP is NOT page size agnostic.
+// This means that bionic's macro PAGE_SIZE is defined.
+func (c Config) NoBionicPageSizeMacro() bool {
+	return Bool(c.config.productVariables.DeviceNoBionicPageSizeMacro)
 }
 
 // The release version passed to aconfig, derived from RELEASE_VERSION