arm64: irqflags: Fix clang build warnings

Clang complains when passing asm operands that are smaller than the
registers they are mapped to:

arch/arm64/include/asm/irqflags.h:50:10: warning: value size does not
	match register size specified by the constraint and modifier
	[-Wasm-operand-widths]
                : "r" (GIC_PRIO_IRQON)

Fix it by casting the affected input operands to a type of the correct
size.
Reported-by: NNathan Chancellor <natechancellor@gmail.com>
Tested-by: NNathan Chancellor <natechancellor@gmail.com>
Signed-off-by: NJulien Thierry <julien.thierry@arm.com>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>

arch/arm64/include/asm/irqflags.h

@@ -47,7 +47,7 @@ static inline void arch_local_irq_enable(void)
 		"dsb	sy",
 		ARM64_HAS_IRQ_PRIO_MASKING)
 		:
-		: "r" (GIC_PRIO_IRQON)
+		: "r" ((unsigned long) GIC_PRIO_IRQON)
 		: "memory");
 }
 
@@ -58,7 +58,7 @@ static inline void arch_local_irq_disable(void)
 		"msr_s  " __stringify(SYS_ICC_PMR_EL1) ", %0",
 		ARM64_HAS_IRQ_PRIO_MASKING)
 		:
-		: "r" (GIC_PRIO_IRQOFF)
+		: "r" ((unsigned long) GIC_PRIO_IRQOFF)
 		: "memory");
 }
 
@@ -91,7 +91,7 @@ static inline unsigned long arch_local_save_flags(void)
 			"csel	%0, %0, %2, eq",
 			ARM64_HAS_IRQ_PRIO_MASKING)
 		: "=&r" (flags), "+r" (daif_bits)
-		: "r" (GIC_PRIO_IRQOFF)
+		: "r" ((unsigned long) GIC_PRIO_IRQOFF)
 		: "memory");
 
 	return flags;