MAINTAINER: Fix Qualcomm ETHQOS ethernet DT file

Commit 83c177ae: ("MAINTAINER: Add entry for Qualcomm ETHQOS
ethernet driver") added incorrect filename for DT binding, fix the same.

Fixes: 83c177ae ("MAINTAINER: Add entry for Qualcomm ETHQOS ethernet driver")
Reported-By: Joe Perches <joe@perches.com>
Reviewed-by: Amit Kucheria <amit.kucheria@linaro.org>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Andy Gross <agross@kernel.org>