Kernel: Don't link Prekernel against kernel_heap

This was added in b5c98ede084e5d29, but it looks like a copy-paste
mistake from Kernel/CMakeLists.txt.

Unbreaks building for aarch64.

Kernel/Prekernel/CMakeLists.txt

@@ -44,9 +44,9 @@ target_link_options(${PREKERNEL_TARGET} PRIVATE LINKER:-T ${CMAKE_CURRENT_SOURCE
 set_target_properties(${PREKERNEL_TARGET} PROPERTIES LINK_DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/linker.ld)
 
 if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
-    target_link_libraries(${PREKERNEL_TARGET} PRIVATE kernel_heap gcc)
+    target_link_libraries(${PREKERNEL_TARGET} PRIVATE gcc)
 elseif(CMAKE_CXX_COMPILER_ID MATCHES "Clang$")
-    target_link_libraries(${PREKERNEL_TARGET} PRIVATE kernel_heap "clang_rt.builtins-${SERENITY_CLANG_ARCH}" c++abi)
+    target_link_libraries(${PREKERNEL_TARGET} PRIVATE "clang_rt.builtins-${SERENITY_CLANG_ARCH}" c++abi)
 endif()
 
 if ("${SERENITY_ARCH}" STREQUAL "i686" OR "${SERENITY_ARCH}" STREQUAL "x86_64")