disp: msm: sde: Validate transaction counts for LUTDMA abs writes

Existing LUTDMA hardware runs into issues when an odd number of
LUTDMA absolute address writes are executed before a GDSC power
collapse. Update LUTDMA logic to force absolute write payloads to
always contain an even number of writes.

Change-Id: I476feeab550f4b176d0adccaa5f2d38041e87657
Signed-off-by: Christopher Braga <cbraga@codeaurora.org>

msm/sde/sde_kms.h

@@ -262,6 +262,7 @@ struct sde_kms {
 	/* io/register spaces: */
 	void __iomem *mmio, *vbif[VBIF_MAX], *reg_dma, *sid;
 	unsigned long mmio_len, vbif_len[VBIF_MAX], reg_dma_len, sid_len;
+	unsigned long reg_dma_off;
 
 	struct regulator *vdd;
 	struct regulator *mmagic;