board: dragonboard410c: Drop unused linux_image

This does not seem to be used anywhere.

Signed-off-by: Stephan Gerhold <stephan.gerhold@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by:
Link: https://lore.kernel.org/r/20250407-db410c-fixes-v1-6-524aefbc8bb4@linaro.org
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
diff --git a/board/qualcomm/dragonboard410c/dragonboard410c.env b/board/qualcomm/dragonboard410c/dragonboard410c.env
index 57a3003..eb42c0a 100644
--- a/board/qualcomm/dragonboard410c/dragonboard410c.env
+++ b/board/qualcomm/dragonboard410c/dragonboard410c.env
@@ -1,7 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0+ */
 loadaddr=0x81000000
 initrd_high=0xffffffffffffffff
-linux_image=Image
 kernel_addr_r=0x81000000
 fdtfile=qcom/apq8016-sbc.dtb
 fdt_addr_r=0x83000000