build: upgrade to go 1.17 and dependencies

vendor/periph.io/x/periph/host/doc.go

@@ -4,7 +4,7 @@
 
 // Package host defines the host itself.
 //
-// The host is the machine where this code is running.
+// Is it now superseded by https://periph.io/x/host/v3 (or later).
 //
-// Subpackages contain the drivers that are loaded automatically.
+// See https://periph.io/news/2020/a_new_start/ for more details.
 package host

vendor/periph.io/x/periph/host/pine64/pine64.go

@@ -6,12 +6,13 @@ package pine64
 
 import (
 	"errors"
-	"os"
+	"strings"
 
 	"periph.io/x/periph"
 	"periph.io/x/periph/conn/pin"
 	"periph.io/x/periph/conn/pin/pinreg"
 	"periph.io/x/periph/host/allwinner"
+	"periph.io/x/periph/host/distro"
 )
 
 // Present returns true if running on a Pine64 board.
@@ -19,9 +20,7 @@ import (
 // https://www.pine64.org/
 func Present() bool {
 	if isArm {
-		// This is iffy at best.
-		_, err := os.Stat("/boot/pine64.dtb")
-		return err == nil
+		return strings.HasPrefix(distro.DTModel(), "Pine64")
 	}
 	return false
 }