feat(gicv3): enlarge the range for intr_num of structure interrupt_prop_t

feat(gicv3): enlarge the range for intr_num of structure interrupt_prop_t

As the max ESPI can be 5119, so enlarge the intr_num range of
structure interrupt_prop_t. After the patch the ESPI can be add to
this macro:
define PLATFORM_G1S_PROPS(grp) \
	INTR_PROP_DESC(197 - 32 + 4576, GIC_HIGHEST_SEC_PRIORITY, (grp), GIC_INTR_CFG_EDGE), \
	INTR_PROP_DESC(199 - 32 + 4576, GIC_HIGHEST_SEC_PRIORITY, (grp), GIC_INTR_CFG_EDGE)

The firmware-design.rst will be updated accordingly.

Signed-off-by: Ming Huang <huangming@linux.alibaba.com>
Change-Id: Ic923868bb1b00c017410dc2aeabfda58ee54782f