sifive: fix palmer's email address

Fix Palmer's email address

Signed-off-by: Pragnesh Patel <pragnesh.patel@sifive.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
diff --git a/board/sifive/fu540/MAINTAINERS b/board/sifive/fu540/MAINTAINERS
index 702d803..5381fc0 100644
--- a/board/sifive/fu540/MAINTAINERS
+++ b/board/sifive/fu540/MAINTAINERS
@@ -1,6 +1,6 @@
 SiFive FU540 BOARD
 M:	Paul Walmsley <paul.walmsley@sifive.com>
-M:	Palmer Dabbelt <palmer@sifive.com>
+M:	Palmer Dabbelt <palmer@dabbelt.com>
 M:	Anup Patel <anup.patel@wdc.com>
 M:	Atish Patra <atish.patra@wdc.com>
 S:	Maintained