arch: common: Removed unnecessary cast

Removed an unnecessary cast to void * from a function that already
had the correct signature.
This makes for more portable code as casting between code and data
pointers are frowned upon by the C standard.

Signed-off-by: Lars-Ove Karlsson <lars-ove.karlsson@iar.com>

arch/common/isr_tables.c

@@ -90,7 +90,7 @@ uintptr_t __irq_vector_table _irq_vector_table[IRQ_TABLE_SIZE] = {
 #ifdef CONFIG_GEN_SW_ISR_TABLE
 struct _isr_table_entry __sw_isr_table _sw_isr_table[IRQ_TABLE_SIZE] = {
 	[0 ...(IRQ_TABLE_SIZE - 1)] = {(const void *)0x42,
-				       (void *)&z_irq_spurious},
+				       &z_irq_spurious},
 };
 #endif