[PART1 RFC v2 04/10] svm: clean up V_TPR, V_IRQ, V_INTR_PRIO, and V_INTR_MASKING

From: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Now that we have defined the bit field, use them to replace existing macros. This patch s