gpio/pca955x: Update maintainer email address

It was noticed that my linux.vnet.ibm.com address does not
always work so dropping the vnet to see if that works better.

Signed-off-by: Glenn Miles <milesg@linux.ibm.com>
Message-ID: <20240328194914.2145709-1-milesg@linux.vnet.ibm.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

Author: milesg-github

MAINTAINERS

@@ -1545,7 +1545,7 @@ F: pc-bios/skiboot.lid
 F: tests/qtest/pnv*
 
 pca955x
-M: Glenn Miles <milesg@linux.vnet.ibm.com>
+M: Glenn Miles <milesg@linux.ibm.com>
 L: qemu-ppc@nongnu.org
 L: qemu-arm@nongnu.org
 S: Odd Fixes