tpm_crb: use __le64 annotated variable for response buffer address

use __le64 annotated variable for response buffer address as this is
read in little endian format form the register.

This suppresses sparse warning
drivers/char/tpm/tpm_crb.c:558:18: warning: cast to restricted __le64

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>

drivers/char/tpm/tpm_crb.c

@@ -471,6 +471,7 @@ static int crb_map_io(struct acpi_device *device, struct crb_priv *priv,
 	u32 pa_high, pa_low;
 	u64 cmd_pa;
 	u32 cmd_size;
+	__le64 __rsp_pa;
 	u64 rsp_pa;
 	u32 rsp_size;
 	int ret;
@@ -536,8 +537,8 @@ static int crb_map_io(struct acpi_device *device, struct crb_priv *priv,
 		goto out;
 	}
 
-	memcpy_fromio(&rsp_pa, &priv->regs_t->ctrl_rsp_pa, 8);
-	rsp_pa = le64_to_cpu(rsp_pa);
+	memcpy_fromio(&__rsp_pa, &priv->regs_t->ctrl_rsp_pa, 8);
+	rsp_pa = le64_to_cpu(__rsp_pa);
 	rsp_size = crb_fixup_cmd_size(dev, &io_res, rsp_pa,
 				      ioread32(&priv->regs_t->ctrl_rsp_size));