Revert "arm64: smp: avoid NMI IPIs with broken MediaTek FW"

This reverts commit a07a594152173a3dd3bdd12fc7d73dbba54cdbca.

This is no longer needed after the patch ("arm64: Move MediaTek GIC
quirk handling from irqchip to core).

Signed-off-by: Douglas Anderson <[e-mail]>
Acked-by: Mark Rutland <[e-mail]>
Acked-by: Marc Zyngier <[e-mail]>
Tested-by: AngeloGioacchino Del Regno <[e-mail]>
Link: https://lore.kernel.org/r/20231107072651.v2.2.I2c5fa192e767eb3ee233bc28eb60e2f8656c29a6@changeid
Signed-off-by: Catalin Marinas <[e-mail]>

arch/arm64/kernel/smp.c

···
 
 static bool ipi_should_be_nmi(enum ipi_msg_type ipi)
 {
-	DECLARE_STATIC_KEY_FALSE(supports_pseudo_nmis);
-
-	if (!system_uses_irq_prio_masking() ||
-	    !static_branch_likely(&supports_pseudo_nmis))
+	if (!system_uses_irq_prio_masking())
 		return false;
 
 	switch (ipi) {

drivers/irqchip/irq-gic-v3.c

···
  * - Figure 4-7 Secure read of the priority field for a Non-secure Group 1
  *   interrupt.
  */
-DEFINE_STATIC_KEY_FALSE(supports_pseudo_nmis);
+static DEFINE_STATIC_KEY_FALSE(supports_pseudo_nmis);
 
 DEFINE_STATIC_KEY_FALSE(gic_nonsecure_priorities);
 EXPORT_SYMBOL(gic_nonsecure_priorities);