Revert "BACKPORT: kgsl: hwsched: Don't cross dereference kgsl_mem_entry pointer"

This reverts commit d4244a42.

According to Qualcomm, this platform is not affected [1]. It causes NULL
pointer dereference on older kernels due to the lack of https://github.com/torvalds/linux/commit/976b6d97c62347df3e686f60a5f455bb8ed6ea23.

[1] https://docs.qualcomm.com/product/publicresources/securitybulletin/june-2024-bulletin.html#_cve-2024-21478


Change-Id: Ic50a8c89ec9f0b4f56ac90125be646147bae5f20
Signed-off-by: Alexander Winkowski <dereference23@outlook.com>