Implement HlReadApicRegister() and HlWriteApicRegister() routines for basic APIC support

xtoskrnl/CMakeLists.txt

@@ -13,6 +13,7 @@ list(APPEND XTOSKRNL_SOURCE
     ${XTOSKRNL_SOURCE_DIR}/ar/${ARCH}/procsup.c
     ${XTOSKRNL_SOURCE_DIR}/ar/${ARCH}/traps.c
     ${XTOSKRNL_SOURCE_DIR}/ex/rundown.c
+    ${XTOSKRNL_SOURCE_DIR}/hl/apic.c
     ${XTOSKRNL_SOURCE_DIR}/hl/cport.c
     ${XTOSKRNL_SOURCE_DIR}/hl/efifb.c
     ${XTOSKRNL_SOURCE_DIR}/hl/globals.c