16kb: Remove PRODUCT_BOOTS_16K build variable

The PRODUCT_BOOTS_16K is removed and will be
replaced by TARGET_BOOTS_16K variable.

The TARGET_BOOTS_16K will drive the kernel and
modules to use instead.

Bug: 350529323
Bug: 346868433
Test: Built and boot pgagnostic targets
Flag: EXEMPT bugfix
Change-Id: If539f8a9f8c87650b8f618f302eee2c284d8ec79
diff --git a/core/product.mk b/core/product.mk
index a567d8f..5ceccbf 100644
--- a/core/product.mk
+++ b/core/product.mk
@@ -37,9 +37,6 @@
 # Boolean variable determining if AOSP relies on bionic's PAGE_SIZE macro.
 _product_single_value_vars += PRODUCT_NO_BIONIC_PAGE_SIZE_MACRO
 
-# Boolean variable determining if the kernel boots with 16kb page size kernel.
-_product_single_value_vars += PRODUCT_BOOTS_16K
-
 # The resource configuration options to use for this product.
 _product_list_vars += PRODUCT_LOCALES
 _product_list_vars += PRODUCT_AAPT_CONFIG