irqchip/gic-v3: Fix compiling error on ARM32 with GICv3

hulk inclusion
category: bugfix
bugzilla: NA
CVE: NA

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/builds/1mHAjaH6WFVPAq6OVOJsJsJKHA2/drivers/irqchip/irq-gic-v3.c: In function 'gic_cpu_init':
/builds/1mHAjaH6WFVPAq6OVOJsJsJKHA2/drivers/irqchip/irq-gic-v3.c:888:3: error: implicit declaration of function 'ipi_set_nmi_prio' [-Werror=implicit-function-declaration]
  888 |   ipi_set_nmi_prio(rbase, GICD_INT_NMI_PRI);
      |   ^~~~~~~~~~~~~~~~

On ARM32, ipi_set_nmi_prio() is not implmented as CONFIG_ARM64_PSEUDO_NMI
is not supported. Skip setting the NMI priority of SGIs when initializing.

Signed-off-by: Wei Li <liwei391@huawei.com>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Cheng Jian <cj.chengjian@huawei.com>