Kernel/aarch64: Add -mstrict-align flag to Kernel build

The ARM CPU is set up to trap on unaligned accesses, however the
compiler will still generate them if this flag is not set. We also need
the -Wno-cast-align as there are some files in AK that don't build
without the flag.

Kernel/CMakeLists.txt

@@ -671,6 +671,10 @@ endif()
 
 if ("${SERENITY_ARCH}" STREQUAL "aarch64")
     add_compile_options(-fno-threadsafe-statics)
+
+    # Unaligned memory access will cause a trap, so to make sure the compiler doesn't generate
+    # those unaligned accesses, this flag is added.
+    add_compile_options(-mstrict-align -Wno-cast-align)
 endif()
 
 add_compile_definitions(KERNEL)