Delete soc/qualcomm/sdm845

Work on this SoC was abandoned and never finished. It's not really
usable in its current state, so let's get rid of it.

Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: I23453e3e47ac336ab61687004470e5e79172cafe
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47428
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

util/docker/coreboot.org-status/board-status.html/tohtml.sh

@@ -443,9 +443,6 @@ EOF
 			QUALCOMM_QCS405)
 				cpu_nice="Qualcomm QCS405";
 				socket_nice="—";;
-			QUALCOMM_SDM845)
-				cpu_nice="Qualcomm SDM845";
-				socket_nice="—";;
 			ROCKCHIP_RK3288)
 				cpu_nice="Rockchip RK3288";
 				socket_nice="—";;