tu, freedreno: Write PC_DGEN_SU_CONSERVATIVE_RAS_CNTL

Prevent other processes writing this from messing us up.

Cc: mesa-stable
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33152>

src/freedreno/vulkan/tu_cmd_buffer.cc

@@ -1483,6 +1483,8 @@ tu6_init_static_regs(struct tu_device *dev, struct tu_cs *cs)
       tu_cs_emit_regs(cs, A7XX_PC_TESS_FACTOR_SIZE(TU_TESS_FACTOR_SIZE));
    }
 
+   tu_cs_emit_regs(cs, A6XX_PC_DGEN_SU_CONSERVATIVE_RAS_CNTL());
+
    /* There is an optimization to skip executing draw states for draws with no
     * instances. Instead of simply skipping the draw, internally the firmware
     * sets a bit in PC_DRAW_INITIATOR that seemingly skips the draw. However

src/gallium/drivers/freedreno/a6xx/fd6_emit.cc

@@ -1038,6 +1038,8 @@ fd6_emit_static_regs(struct fd_context *ctx, struct fd_ringbuffer *ring)
    OUT_PKT4(ring, REG_A6XX_SP_PS_TP_BORDER_COLOR_BASE_ADDR, 2);
    OUT_RELOC(ring, bcolor_mem, 0, 0, 0);
 
+   OUT_REG(ring, A6XX_PC_DGEN_SU_CONSERVATIVE_RAS_CNTL());
+
    /* These regs are blocked (CP_PROTECT) on a6xx: */
    if (CHIP >= A7XX) {
       OUT_REG(ring,