refactor(gicv3): use helper functions to get SPI/ESPI INTID limit

Use helper functions to get SPI and ESPI INTID limit, to remove
several pieces of similar code in gicv3 driver.

Signed-off-by: Heyi Guo <guoheyi@linux.alibaba.com>
Change-Id: Iaf441fe5e333c4260e7f6d98df6fdd931591976d
2 files changed