dashboard: update host-linux-loong64-3a5000 owner, ExpectNum, bootstrap

For golang/go#46229

Change-Id: I817d6af1735fb5ca659d4537d401e93ce8e08df0
Reviewed-on: https://go-review.googlesource.com/c/build/+/453457
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Auto-Submit: Carlos Amedee <carlos@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: xiaodong liu <teaofmoli@gmail.com>

dashboard/builders.go

@@ -353,12 +353,12 @@ var Hosts = map[string]*HostConfig{
 	},
 	"host-linux-loong64-3a5000": {
 		Notes:       "Loongson 3A5000 Box hosted by Loongson; loong64 is the short name of LoongArch 64 bit version",
-		Owners:      []*gophers.Person{gh("XiaodongLoong")},
+		Owners:      []*gophers.Person{gh("XiaodongLoong"), gh("abner-chenc")},
 		IsReverse:   true,
-		ExpectNum:   3,
-		GoBootstrap: "none", // image has Go 1.18; cannot access storage.googleapis.com
+		ExpectNum:   5,
+		GoBootstrap: "none",
 		env: []string{
-			"GOROOT_BOOTSTRAP=/usr/lib/go-1.18",
+			"GOROOT_BOOTSTRAP=/usr/lib/go-linux-loong64-bootstrap",
 		},
 	},
 	"host-linux-mips64-rtrk": {

internal/gophers/gophers.go

@@ -2957,6 +2957,7 @@ func init() {
 	addPerson("Zvonimir Pavlinovic", "zpavlinovic@google.com", "@zpavlinovic")
 	addPerson("a.lukinykh", "a.lukinykh@xsolla.com")
 	addPerson("abdul.mannan", "abdul.mannan@thirdbridge.com")
+	addPerson("abner chenc", "@abner-chenc")
 	addPerson("acoshift", "acoshift@gmail.com")
 	addPerson("adrienpetel", "peteladrien@gmail.com", "@feliixx")
 	addPerson("aecdanjun", "aeciodantasjunior@gmail.com", "@aecdanjun")