MIPS: Loongson64: Prefix ipi register address pointers with __iomem

They are truely mmio pointers, so give them proper prefix.
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/loongson64/smp.c

@@ -27,11 +27,11 @@ DEFINE_PER_CPU(int, cpu_state);
 
 #define LS_IPI_IRQ (MIPS_CPU_IRQ_BASE + 6)
 
-static void *ipi_set0_regs[16];
-static void *ipi_clear0_regs[16];
-static void *ipi_status0_regs[16];
-static void *ipi_en0_regs[16];
-static void *ipi_mailbox_buf[16];
+static void __iomem *ipi_set0_regs[16];
+static void __iomem *ipi_clear0_regs[16];
+static void __iomem *ipi_status0_regs[16];
+static void __iomem *ipi_en0_regs[16];
+static void __iomem *ipi_mailbox_buf[16];
 static uint32_t core0_c0count[NR_CPUS];
 
 /* read a 32bit value from ipi register */